Add crates.io 'log' to dependencies

The log crate should be coming from crates.io in the future.
See the PR [here](rust-lang/rust#19820).

Author: cyderize

Cargo.toml

@@ -7,3 +7,6 @@ license = "MIT"
 description = "Strongly Typed Mimes"
 documentation = "http://hyperium.github.io/mime.rs"
 repository = "https://github.com/hyperium/mime.rs"
+
+[dependencies]
+log = "*"