fix animation tween unit test.
Fix for tweening # 2.
Merge pull request #950 from jtwigg/v3.2

V3.2 Fix Tweening Unit Test.
Reapplying the render state fix CCLabelTTF. Looks like it was accidentally removed when reverting other changes.
Tween compatible instant easing fix
Merge branch 'v3.1' into v3.2
Merge branch 'v3.2' into develop

Conflicts:
	cocos2d-tests-ios.xcodeproj/project.pbxproj
	cocos2d/CCRenderer.m
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-iphone into develop