Simplify the testOnePeriod method.

Add TensorExpression

Make browserable C++ source code into HTMLs

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.