* 1. add weight decay feature into fluid benchmark test
2. add learning rate decay feature into fluid benchmark test
3. add L1&L2 regularization feature into fluid benchmark test
4. add error clipping feature into fluid benchmark test
5. add gradient clipping feature into fluid benchmark test
* Add some document to README.md under benchmark/fluid/ repo
* Add model_base.py
* Fix bugs in test_listen_and_serv_op
* 1. remove args out of fluid_benchmark.py
2. remove lr_decay, regularization, clipping out of fluid_benchmark.py
* add async_mode description to doc and remove the clipping description out
* for restart build
* to restart build
* remove optimization args from args.py
* 1. remove optimization from models
2. fix bug in test_listen_and_serv_op
* change the name retry_times to left_time
* change retry_times to the pserver start left time
Qiyang Min
Wu Yi
gongweibao
Xin Pan
yi.wu