unify the way how demos runs in models repo and codes organization.

[lcy-seso]

• Currently, how each demos run in models repo varies from demo to demo. Except for some very complicated demo, for example, DS2, it is better to unify the organization of the code.
• At least the following work is required:
  • create command line interfaces for each example.
  • add docstring for each important function, and unify the style of docstring. Keep the style be consistent with PaddlePaddle main repo.

[will-am]

把代码组织成
train.py
infer.py
reader.py
network_conf.py
怎么样？

对于生成模型不用infer.py，用generate.py

但现在的代码里模型配置有叫network_conf.py的，也有叫model.py的，不知用哪个好？

[shanyi15]

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