Rust update: s/if_ok!/try!/ (mozilla/rust#12401)
Implemented request body reading by letting RequestBuffer implement Reader
Rust update: `extra::time` has moved out to a separate library
Rust update: `HashSet` moved to libcollections
Rust update: The `ToStr` trait will be replaced wit `Show`
Merge pull request #62 from Ogeon/master

Implemented request body reading
Rust update: FromStr is gone from the prelude.

mozilla/rust#12485
Rust update: ToStrRadix is gone from the prelude.

mozilla/rust#12485