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
Fix crash for call runAnimation() in CCBAnimationManagerDelegate::completedAnimationSequenceNamed; Set mRunningSequence to NULL before any runAnimation() call;
Missing subproject
Enable Windows XP support in Visual Studio 2012 Update 1.

Not tested with Visual Studio 2010, not sure will it work with PlatformToolset v110_xp.
Setting Windows app title
ESC button on Windows behaves like Back button
Merge branch 'gles20' of https://github.com/cocos2d/cocos2d-x into gles20
Setting PlatformToolSet to v110_xp for Visual Studio 2012 only.