Don't export the inner "sdl" module; it's redundant and has led to confusion
Add AudioFormat aliases to LL AUDIO_U16/S16 macros.
Add mixer::Chunk::from_wav.
Merge pull request #44 from lifthrasiir/mixer

Add mixer::Chunk::from_wav.
Merge pull request #43 from lifthrasiir/audio

Add AudioFormat aliases to LL AUDIO_U16/S16 macros.
Merge branch 'inner-sdl' of git://github.com/pcwalton/rust-sdl into pcwalton-inner-sdl
Made Mixer use get_error correctly
Compiles against latest Incoming
Reintroduced missing imports. Whoops.