adding debug support for js
Merge branch 'gles20' of git://github.com/cocos2d/cocos2d-x into gles20
more debug stuff
Merge branch 'gles20' of git://github.com/cocos2d/cocos2d-x into gles20

Conflicts:
	scripting/javascript/bindings/ScriptingCore.h
	scripting/javascript/bindings/js_bindings_config.h
issue #1660: Disabled js debugger by default since lack of `js_bindings_dbg.h` file.
Merge pull request #1852 from dumganhar/iss1660-js-debugger

issue #1660: Adding debug support for js