Merge pull request #11 from brson/master

Update for language changes
Add an RGBA struct (without the CurrentColor variant.)
Merge pull request #12 from SimonSapin/master

Add an RGBA struct (without the CurrentColor variant.)
Add Clone and Eq on cssparser::Color.
Use #[deriving(Clone, Eq)] rather than two attributes.
Merge pull request #13 from SimonSapin/master

Add Clone and Eq on cssparser::Color.
Use from_u32 to cast to char