Updated for Rust 20150109

[ktossell]

Changes include

• Move Show implementation for address-like things to String; derive(Show)
• Switch to slice[a..b] syntax
• uint -> usize
• 5322parser.consume_while now takes Fn(char) -> bool, not a closure
• Bumped version and updated dependencies

[ktossell]

Aaaaaaaaaaaaand you just fixed it

[niax]

Here's hoping that we don't have to do this much more.

I spotted you've started using the slicing syntax - this goes towards #10 so feel free to make a new PR for that.