Merge pull request #1822 from pandamicro/develop

Remove a useless variable in CCClass
Issue #5019: ccui.ImageView The picture is not pre loaded setSize invalid
Merge pull request #1823 from VisualSJ/develop-degrees

Issue #5019: ccui.ImageView The picture is not pre loaded setSize invali...
Issue #5019: ccui.ImageView The picture is not pre loaded setSize invalid
Merge pull request #1824 from VisualSJ/develop-degrees

Issue #5019: ccui.ImageView The picture is not pre loaded setSize invali...
Issue #4986: May exceed the maximum margin of rect
Issue #4986: Reduction of CCSpriteFrameCache rotation method
Issue #4986: May exceed the maximum margin of rect
Merge pull request #1825 from VisualSJ/develop-clone

Issue #4986: May exceed the maximum margin of rect
Issue #5040: Improve ParticleSystem default initialization, no init function call if no parameter given