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

* install wheels when invoke paddle script if current python don't
  have paddle packages, or installed a previous version.
* Also add `make install` to travis