1: fix CCTouchScriptHandlerEntry will release twice lua reference
2: fix the error when texture stroke lable under IOS and Android.
fix the CCTouchScriptHandlerEntry will release twice lua reference.
the _handler must set 0, not NULL.
Merge commit 'refs/pull/3682/head' of git://github.com/cocos2d/cocos2d-x into pr-3682
closed #2848: Fill Color and Stroke color of TTF are missing precision
Merge pull request #3810 from dumganhar/pr-3682

Merge PR https://github.com/cocos2d/cocos2d-x/pull/3682