Merge pull request #1 from lifthrasiir/i686-compat-rwops

make RWops compatible to i686 platform; also add more patterns to .gitig...
Merge remote-tracking branch 'upstream/master'
add a workable SDL_audio implementation
fix unhandled error in calling RWops::from_file
fix return type error
sdl_audio: implement AudioCVT
Merge pull request #75 from andelf/add-sdl-audio-support

Add sdl audio support.