* user new save load in all dygraph modell; test=develop

* change load_dict to set_dict; test=develop

add copyright for cycle_gan and se_resnext

load_persistables function returns a tuple which include parameters and optimizer

1.Modify the checkpoint save path
2. Modifiy the img save paht
3. Synchronous modification for Readme
4. update generated result img

* add cycle_gan for dygraph

* upload download

* polish code

* fix bug

* fix some erro

* add infer

* refine code

* refine code

* matching bn

* add infer images

* update readme

* update readme

* replace pics

* Update README.md

* modified for conv2d