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.