Merge pull request #1 from yrom/master

修复被虚拟按键挡住的问题，及虚拟按键随控制条显隐
FFMoviePlayer: fix buffering start status
ijkplayer: optimized buffering
ios: optimize seek response
ios: handle audio interruption
ios: refactor out AudioSession from Audio Output
ios: handle audio interruption
add license header
ios: using AudioQueue instead of AudioUnit
NEWS.md: mention AudioQueue api
build: fix typo
ios: stop AudioQueue async
ios: naming ivar with underscore
ijksdl/android: fix typo
ijksdl/ios: fix frame pitch padding
do not commit .cproject
remove unused list player
simplify listener handle
ios: do not strip debug symbol
build: share same config files