Created by: gongweibao

1. If we try it for two or more times, kernel will die because google log can't be inited repeatedly

paddle.init(use_gpu=False, trainer_count=1)

2. Do we need move index.html.tmpl and index.html.json to other directory?Because user need not to know these files？

3. We need a script to check ipynb files quickly。@gongweibao

4. Do we need to rm Chinese documents, and keep only English documents?

5. Modify travis to auto build and push book docker image @gongweibao

6. Machine_translation reports error after running some batchs @jacquesqiao #234