fix bugs in CCDictionary & platform/win32/CCImage.cpp::setFont, according to BitWave's codereview.
fix bugs in CCDictionary::objectForKey(int/string)
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20

Conflicts:
	cocos2dx/cocoa/CCDictionary.cpp
	cocos2dx/platform/win32/CCImage.cpp
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Added cc.DrawNode.extend.
Merge pull request #1756 from dumganhar/gles20

Added cc.DrawNode.extend.
Fix crash for call runAnimation() in CCBAnimationManagerDelegate::completedAnimationSequenceNamed; Set mRunningSequence to NULL before any runAnimation() call;
fixed #1614: DrawNodeTest crashes on JSB.
Updated the submodule reference of cocos2d-js-tests to the latest version.
Merge pull request #1759 from dumganhar/gles20

fixed #1614: DrawNodeTest crashes on JSB.
fix android compile warning