添加python的c扩展文档
Updating CocosbuilderLearning.md.
Adding learning-travis-ci.md
Merge pull request #11 from honghui/gh-pages

第四课
Merge pull request #12 from ibaozi/gh-pages

python_c_moudle
Merge pull request #13 from dumganhar/travis-and-ccb

Adding learning-travis-ci.md and updating CocosbuilderLearning.md.
main page add travis-ci topic.
Modify opengles2.0 repo url.
Add topic DevGameByCocos2d
Merge pull request #3 from yangws/gh-pages

更新