change cc.REPEAT_FOREVER

Hi

kRepeatForever is (UINT_MAX -1) so, cc.REPEAT_FOREVER should be 0xfffffffe instead of 0xffffffff
Merge pull request #752 from seobyeongky/patch-3

change cc.REPEAT_FOREVER
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js