rebase

fix protobuf size limit of seq2seq demo

Customized Paddle's document theme

config_parser增加新特性：支持同一个python文件内配置paddle

Re-design command options for testing for better understanding

add execute property by default for some top scripts

merge PaddlePaddle/Paddle

Conflicts:
	doc/conf.py.in
	doc_cn/conf.py.in
	doc_theme/static/css/override.css
	doc_theme/static/js/paddle_doc_init.js
	doc_theme/templates/layout.html

Auto compare cpu and gpu function.

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

Add Pythonlib and PythonIntep FAQ

Replace m4 template by Dockerfile ARGs

Support rectangle input for CNN

Benchmark including PaddlePaddle, TensorFlow and Caffe.

fix bug when run test_layerHelpers multiple times

Add .dockerignore as an alias of .gitignore

Re-define the way we build Docker images

Demo: Generative Adverserial Nets

Fix --job=test