fixed #2530 LabelTTF's Stroke style has been modified to outer stroke
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2530_ModifyLabelTTFStrokeStyle
Merge pull request #1077 from dingpinglv/Iss2530_ModifyLabelTTFStrokeStyle

fixed #2530 LabelTTF's Stroke style has been modified to outer stroke