issue #2305:remove unneeded comment
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into iss2305-replace-pthread
issue #2305:use c++11 thread correctly
closed #2305: fix a running time error
Merge pull request #3006 from minggo/iss2305-replace-pthread

fix some errors of c++11 thread usage in CCTextureCache