Updated .classpath of Android project to latest ADT 22 build tool compatibility.

Changes correspond to: https://groups.google.com/forum/?fromgroups#!msg/adt-dev/epOfZbKPFdk/RbR2VYNQ5_8J
Implement audio for Emscripten using SDL. Still needs methods to release samples when we're done with them.
Implementing foreground and background status and modify CocosDenshion comment.
Make shadowOffset parameter of CCLabelTTF::enableShadow(…) a const reference.
Add audio cleanup methods for Emscripten.
Bump Emscripten version
Merge pull request #2609 from j4m3z0r/emscriptenate

Add Audio Support for Emscripten
Merge pull request #2608 from FlowerpotGames/CCLabelTTF-Const-Update

CCLabelTTF::enableShadow(…) const update
Update AUTHORS

[ci ignore]
Update AUTHORS

[ci ignore]
Merge pull request #2591 from nicolasgramlich/patch-1

Updated .classpath of Android project to latest ADT 22 build tool compatibility.
fixed #1644: Passing NULL parameter to ccdictionary_to_jsval will cause crash.
Merge pull request #2610 from dumganhar/iss1644-dict2jsval-crash

fixed #1644: Passing NULL parameter to ccdictionary_to_jsval will cause crash, and improving performance for ccarray_to_jsval.
Remove EVENT_COME_TO_BACKGROUND notification.
Merge pull request #2607 from pyrasis/background_foreground_tizen

Implementing foreground and background status for Tizen port.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x into Quick-cocos2d-x