Spelling fix.
CCActionCallFunc set target node to weak, Setup scheduler in CCAnimationManager only if added to a node (onEnter)
Opacity KeyFrame not using float values spritebuilder/SpriteBuilder#658
Node visibility flag not honoured on CCBFile child nodes spritebuilder/SpriteBuilder#659
Merge pull request #854 from cocojoe/v3.1

Fixes for high priority issues and other smaller issues.
Merge branch 'v3.1' of github.com:cocos2d/cocos2d-iphone into v3.1
Make uniform dictionary copying behavior of CCRenderState explicit for immutability purposes. Fix a minor garbage creation issue with CCTTFLabel and CCRenderTexture.
Merge branch 'v3.1' into develop
Merge remote-tracking branch 'upstream/develop' into develop