fix bug: ProgressTime can't change color and opacity
Update CCClass.js

add object instance id
delete _updateColor() in _updateProgressForWebGL()
bug: TextButton cant change text color
Update CCActionManager.js

Find a way to optimize the object
init comment
Merge pull request #1270 from kuaipao/patch-1

bug: TextButton cant change text color
Add an object instance id
Find a way to optimize the object
Merge pull request #1268 from rablwupei/fix_progressTimer

fix bug: ProgressTime can't change color and opacity
fixed typo "because"
fix the bug that  i  is incorrect after remove a  object
add cc.NodeRGBA.create()
Merge pull request #1272 from luisparravicini/issue-3292

fixed typo "becuase"
Merge pull request #1273 from NijiadeIX/develop

fix the bug : i is incorrect after remove a object
Merge pull request #1271 from xbruce/develop

Update CCClass CCActionManager
Delete README

unused file
Merge pull request #1274 from csaftoiu/NodeRGBA-create

add cc.NodeRGBA.create()
Adding property to prototype
Merge pull request #1277 from ShengxiangChen/issue_ccClass

Adding property to prototype
Closed #3284: Refactoring TMXLayer for better performance

Add sub cache canvas to reduce the cache size, cache is used only when
user’s layer is too big, otherwise use default version.