We don't officially support OSX.
And Travis CI takes a lot of time to build osx. (long time in pending state.
Probably because travis ci don't have enough osx machines.

Fixes #1365

* The $TRAVIS_COMMIT_RANGE could be not existed, because the git history
  can be changed and rebased. Here we alway run Travis-CI when `git diff`
  cannot return the modified files.
* Also do not push docs update if is not PaddlePaddle/Paddle.

2. add unit test library
3. remove useless comments
4. use js & css libs on the CDN

* add patch does not trigger travis ci

* Init

* Add numpy deps

* Refine

* Init commit for doing FAQ

* Add speed up training

* Add graphviz to ci

* Add shared paramter

* Tiny refine

* Add documentation build to ci test
* Push master branch doc changes to gh-pages branch