Issue 615, possible division by zero in duration
Issue 615, possible division by zero in duration

Added two MAX(duration_,0.000001f) checks where duration could be zero in a division

Former-commit-id: 04b79757a61a2d4ab7aa2cf1ad862ab0b03901cb
oxeron/cocos2d-objc,zaneLou/cocos2d-objc,seem-sky/cocos2d-swift,yaoxiaoyong/cocos2d-objc,lpeancovschi/cocos2d-objc,finthamoussu/cocos2d-objc,knight2010/cocos2d-objc,savysoda/cocos2d-objc,tambarskjelve/cocos2d-objc,tambarskjelve/cocos2d-objc,DNESS/cocos2d-objc,codepython/cocos2d-objc,richardgroves/cocos2d-iphone,knight2010/cocos2d-objc,nader-eloshaiker/cocos2d-objc,dnessorga/cocos2d-objc,zaneLou/cocos2d-objc,cogddo/cocos2d-objc,SuPair/cocos2d-objc,lpeancovschi/cocos2d-objc,liduanw/cocos2d-objc,codepython/cocos2d-objc,TukekeSoft/cocos2d-spritebuilder,DNESS/cocos2d-objc,jason-puck/cocos2d-iphone,savysoda/cocos2d-objc,savysoda/cocos2d-objc,liduanw/cocos2d-objc,yaoxiaoyong/cocos2d-objc,cogddo/cocos2d-objc,TukekeSoft/cocos2d-spritebuilder,dnessorga/cocos2d-objc,SuPair/cocos2d-objc,dnessorga/cocos2d-objc,nader-eloshaiker/cocos2d-objc,cogddo/cocos2d-objc,DNESS/cocos2d-objc,SuPair/cocos2d-objc,zaneLou/cocos2d-objc,lpeancovschi/cocos2d-objc,yaoxiaoyong/cocos2d-objc,knight2010/cocos2d-objc,richardgroves/cocos2d-iphone,DNESS/cocos2d-objc,nader-eloshaiker/cocos2d-objc,jason-puck/cocos2d-iphone,oxeron/cocos2d-objc,tambarskjelve/cocos2d-objc,yaoxiaoyong/cocos2d-objc,yaoxiaoyong/cocos2d-objc,liduanw/cocos2d-objc,cocos2d/cocos2d-objc,finthamoussu/cocos2d-objc,TukekeSoft/cocos2d-spritebuilder,knight2010/cocos2d-objc,zaneLou/cocos2d-objc,liduanw/cocos2d-objc,seem-sky/cocos2d-swift,liduanw/cocos2d-objc,tambarskjelve/cocos2d-objc,tambarskjelve/cocos2d-objc,jason-puck/cocos2d-iphone,savysoda/cocos2d-objc,cogddo/cocos2d-objc,SuPair/cocos2d-objc,codepython/cocos2d-objc,finthamoussu/cocos2d-objc,codepython/cocos2d-objc,seem-sky/cocos2d-swift,seem-sky/cocos2d-swift,cocos2d/cocos2d-objc,SuPair/cocos2d-objc,DNESS/cocos2d-objc,lpeancovschi/cocos2d-objc,dnessorga/cocos2d-objc,finthamoussu/cocos2d-objc,nader-eloshaiker/cocos2d-objc,richardgroves/cocos2d-iphone,TukekeSoft/cocos2d-spritebuilder,dnessorga/cocos2d-objc