Merge pull request #56 from libretro/master

(libretro) Go through new logger interface
Added basic timing functions (unix)
Fixed xBR dialog and updated version (win32)
Started adding audio back (unix)
Merge remote-tracking branch 'libretro/master'
Cleaned up audio (unix)
Removed old audio code (unix)
Updated copyright information
Cleaned up video (unix)
Removed "sound effect" code (unix)