Merge pull request #1477 from pandamicro/develop

Fixed #3659: Add retina support to CCEGLView
closed #3666: setCascadeColorEnabled and setCascadeOpacityEnabled of sprite doesn't work well.
Merge pull request #1478 from xingsenma/develop

closed #3666: setCascadeColorEnabled and setCascadeOpacityEnabled of sprite doesn't work well.
Merge pull request #1479 from pandamicro/develop

Fixed #3659: Fixed a bug related to the event location conversion
Fixed #3673: Add swallow option to cc.Layer’s setTouchEnabled function to permit not swallow touches