Merge pull request #47 from nutty898/master

fixed crash of action
fixes #3735 修正输入框删除字符崩溃的问题。
Merge pull request #48 from chengstory/Bug#3738

fixes #3735 修正输入框删除字符崩溃的问题。
Merge branch 'master' of https://github.com/chukong/Cocos2d-x-For-CocoStudio