diff --git a/Cargo.lock b/Cargo.lock
index 3ea8fc2..9bf65c7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,14 +1,14 @@
 [[package]]
 name = "aho-corasick"
-version = "0.5.3"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "ansi_term"
-version = "0.9.0"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -33,7 +33,7 @@ dependencies = [
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -44,9 +44,14 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "bitflags"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "bitflags"
 version = "0.9.1"
@@ -57,6 +62,16 @@ name = "bytecount"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "cargo_metadata"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "serde 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cargo_metadata"
 version = "0.3.3"
@@ -81,24 +96,32 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "clippy"
-version = "0.0.102"
+version = "0.0.174"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "clippy_lints 0.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cargo_metadata 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy_lints 0.0.174 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "clippy_lints"
-version = "0.0.102"
+version = "0.0.174"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "matches 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "if_chain 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itertools 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pulldown-cmark 0.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "quine-mc_cluskey 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "toml 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-normalization 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -106,31 +129,33 @@ name = "colored"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "curl"
-version = "0.4.1"
+version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "curl-sys 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-probe 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl-sys 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "socket2 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "curl-sys"
-version = "0.3.4"
+version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "libz-sys 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libz-sys 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -150,13 +175,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "docopt"
-version = "0.6.86"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -164,13 +190,18 @@ name = "dtoa"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "either"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "env_logger"
-version = "0.3.5"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -188,40 +219,72 @@ dependencies = [
 
 [[package]]
 name = "filetime"
-version = "0.1.10"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "flate2"
-version = "0.2.14"
+version = "0.2.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "miniz-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "miniz-sys 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "gcc"
-version = "0.3.38"
+name = "fuchsia-zircon"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fuchsia-zircon-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
-name = "gdi32-sys"
+name = "fuchsia-zircon-sys"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "getopts"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "glob"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "idna"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "if_chain"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "itertools"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "either 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "itoa"
 version = "0.3.4"
@@ -238,56 +301,57 @@ dependencies = [
 
 [[package]]
 name = "lazy_static"
-version = "0.2.2"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "lazy_static"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.17"
+version = "0.2.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libz-sys"
-version = "1.0.7"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "log"
-version = "0.3.6"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "matches"
-version = "0.1.4"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "memchr"
-version = "0.1.11"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "miniz-sys"
-version = "0.1.7"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "nom"
-version = "1.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "num-traits"
 version = "0.1.41"
@@ -295,25 +359,39 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "openssl-probe"
-version = "0.1.0"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.1"
+version = "0.9.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gdi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "user32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vcpkg 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "pkg-config"
-version = "0.3.8"
+name = "percent-encoding"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "pkg-config"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "pulldown-cmark"
+version = "0.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "getopts 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "pulldown-cmark"
 version = "0.1.0"
@@ -334,27 +412,33 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "rand"
-version = "0.3.14"
+version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.1.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "regex"
-version = "0.1.80"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.3.9"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -363,16 +447,29 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "rustc-serialize"
-version = "0.3.21"
+name = "same-file"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "same-file"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "semver"
-version = "0.2.3"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nom 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -436,12 +533,24 @@ dependencies = [
  "pulldown-cmark 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "walkdir 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "socket2"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "strsim"
-version = "0.5.2"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -464,32 +573,34 @@ dependencies = [
 
 [[package]]
 name = "tar"
-version = "0.4.9"
+version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
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+"checksum same-file 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "70a18720d745fb9ca6a041b37cb36d0b21066006b6cff8b5b360142d4b81fb60"
+"checksum semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a3186ec9e65071a2095434b1f5bb24838d4e8e130f584c790f6033c79943537"
 "checksum semver 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bee2bc909ab2d8d60dab26e8cad85b25d795b14603a0dcb627b78b9d30b6454b"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
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@@ -649,21 +809,27 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum serde_derive_internals 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)" = "75c6aac7b99801a16db5b40b7bf0d7e4ba16e76fbf231e32a4677f271cac0603"
 "checksum serde_json 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7cf5b0b5b4bd22eeecb7e01ac2e1225c7ef5e4272b79ee28a8392a8c8489c839"
 "checksum skeptic 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c8431f8fca168e2db4be547bd8329eac70d095dff1444fee4b0fa0fabc7df75a"
-"checksum strsim 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "67f84c44fbb2f91db7fef94554e6b2ac05909c9c0b0bc23bb98d3a1aebfe7f7c"
+"checksum socket2 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "36b4896961171cd3317c7e9603d88f379f8c6e45342212235d356496680c68fd"
+"checksum strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b4d15c810519a91cf877e7e36e63fe068815c678181439f2f29e2562147c3694"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
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diff --git a/Cargo.toml b/Cargo.toml
index 89e78d7..a4f4663 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,35 +1,36 @@
 [package]
-name = "tealdeer"
-version = "0.4.0"
 authors = ["Danilo Bargen <mail@dbrgn.ch>"]
-repository = "https://github.com/dbrgn/tealdeer/"
+description = "Fetch and show tldr help pages for many CLI commands. Full featured offline client with caching support."
 homepage = "https://github.com/dbrgn/tealdeer/"
 license = "MIT/Apache-2.0"
+name = "tealdeer"
 readme = "README.md"
-description = "Fetch and show tldr help pages for many CLI commands. Full featured offline client with caching support."
+repository = "https://github.com/dbrgn/tealdeer/"
+version = "0.4.0"
 
 [[bin]]
 name = "tldr"
 path = "src/main.rs"
 
-[features]
-logging = ["env_logger"]
-dev = ["clippy"]
-
 [dependencies]
-log = "^0.3"
-xdg = "^2.0"
-tar = "^0.4"
-curl = "^0.4"
-time = "^0.1"
-flate2 = "^0.2"
-docopt = "^0.6"
-walkdir = "^1.0"
-ansi_term = "^0.9"
-rustc-serialize = "^0.3"
-clippy = {version = "~0.0.37", optional = true}
-env_logger = { version = "^0.3", optional = true }
+ansi_term = "0.10.2"
+clippy = { version = "0.0.174", optional = true }
+curl = "0.4.8"
+docopt = "0.8.1"
+env_logger = { version = "0.4.3", optional = true }
+flate2 = "0.2.20"
+log = "0.3.8"
+serde = "1.0.21"
+serde_derive = "1.0.21"
+tar = "0.4.14"
+time = "0.1.38"
+walkdir = "2.0.1"
+xdg = "2.1.0"
 
 [dev-dependencies]
 tempdir = "^0.3"
 assert_cli = "^0.5"
+
+[features]
+dev = ["clippy"]
+logging = ["env_logger"]
diff --git a/src/cache.rs b/src/cache.rs
index cb40a91..ddc5055 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -9,7 +9,7 @@ use xdg::BaseDirectories;
 use flate2::read::GzDecoder;
 use tar::Archive;
 use curl::easy::Easy as CurlEasy;
-use walkdir::{WalkDir, WalkDirIterator, DirEntry};
+use walkdir::{WalkDir, DirEntry};
 use time;
 
 use error::TealdeerError::{self, CacheError, UpdateError};
diff --git a/src/main.rs b/src/main.rs
index cab41fc..30b75c4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -30,9 +30,10 @@ extern crate flate2;
 extern crate tar;
 extern crate xdg;
 extern crate curl;
-extern crate rustc_serialize;
 extern crate time;
 extern crate walkdir;
+#[macro_use]
+extern crate serde_derive;
 
 use std::io::BufReader;
 use std::fs::File;
@@ -89,7 +90,7 @@ To render a local file (for testing):
 const ARCHIVE_URL: &'static str = "https://github.com/tldr-pages/tldr/archive/master.tar.gz";
 const MAX_CACHE_AGE: i64 = 2592000; // 30 days
 
-#[derive(Debug, RustcDecodable)]
+#[derive(Debug, Deserialize)]
 struct Args {
     arg_command: Option<String>,
     flag_help: bool,
@@ -159,7 +160,7 @@ fn main() {
 
     // Parse arguments
     let args: Args = Docopt::new(USAGE)
-                            .and_then(|d| d.decode())
+                            .and_then(|d| d.deserialize())
                             .unwrap_or_else(|e| e.exit());
 
     // Show version and exit
@@ -255,3 +256,29 @@ fn main() {
         process::exit(1);
     }
 }
+
+#[cfg(test)]
+mod test {
+    use Args;
+    use OsType;
+    use USAGE;
+    use docopt::Docopt;
+    use docopt::Error;
+
+    fn test_helper(argv: &[&str]) -> Result<Args, Error> {
+        Docopt::new(USAGE).and_then(|d| d.argv(argv.iter()).deserialize())
+    }
+
+    #[test]
+    fn test_docopt_os_case_insensitive() {
+        let argv = vec!["cp", "--os", "LiNuX"];
+        let os = test_helper(&argv).unwrap().flag_os.unwrap();
+        assert_eq!(OsType::Linux, os);
+    }
+
+    #[test]
+    fn test_docopt_expect_error() {
+        let argv = vec!["cp", "--os", "lindows"];
+        assert!(!test_helper(&argv).is_ok());
+    }
+}
diff --git a/src/types.rs b/src/types.rs
index a67dc33..5e597b4 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -1,9 +1,7 @@
 //! Types used in the client.
 
-use rustc_serialize::{Decodable, Decoder};
-
-
-#[derive(Debug, Eq, PartialEq, Copy, Clone)]
+#[derive(Debug, Eq, PartialEq, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
 #[allow(dead_code)]
 pub enum OsType {
     Linux,
@@ -12,27 +10,6 @@ pub enum OsType {
     Other,
 }
 
-
-/// Custom Decodable implementation, so that we can parse command line arguments
-/// directly into an `OsType` instance.
-impl Decodable for OsType {
-    fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error> {
-        d.read_str().and_then(|input| {
-            let lowercase = input.to_lowercase();
-            match &lowercase[..] {
-                "linux" => Ok(OsType::Linux),
-                "osx" => Ok(OsType::OsX),
-                "sunos" => Ok(OsType::SunOs),
-                "other" => Ok(OsType::Other),
-                _ => Err(d.error(&format!("Invalid OS type: '{}'. Choose one of 'linux', \
-                                           'osx', 'sunos' or 'other'.", lowercase)))
-            }
-        })
-    }
-}
-
-
-
 #[derive(Debug, Eq, PartialEq)]
 pub enum LineType {
     Empty,
@@ -77,31 +54,7 @@ impl LineType {
 
 #[cfg(test)]
 mod test {
-    extern crate rustc_serialize;
-    extern crate docopt;
-
-    use super::OsType::{self, Linux, OsX, SunOs, Other};
     use super::LineType;
-    use rustc_serialize::json;
-
-    #[test]
-    fn test_os_type_decoding_regular() {
-        assert_eq!(json::decode::<OsType>("\"linux\"").unwrap(), Linux);
-        assert_eq!(json::decode::<OsType>("\"osx\"").unwrap(), OsX);
-        assert_eq!(json::decode::<OsType>("\"sunos\"").unwrap(), SunOs);
-        assert_eq!(json::decode::<OsType>("\"other\"").unwrap(), Other);
-    }
-
-    #[test]
-    fn test_os_type_decoding_uppercase() {
-        assert_eq!(json::decode::<OsType>("\"Linux\"").unwrap(), Linux);
-        assert_eq!(json::decode::<OsType>("\"LINUX\"").unwrap(), Linux);
-    }
-
-    #[test]
-    fn test_os_type_decoding_unknown() {
-        assert!(json::decode::<OsType>("\"lindows\"").is_err());
-    }
 
     #[test]
     fn test_linetype_from_str() {