* API update of video model
* update api and refine bmn dygraph implementation
* refine Readme and config of bmn dygraph
* fix reademe and reader
* fix details

* fix bug of annotation file root

* fix bug of feature file not exists

* fix bmn model implemented with dynamic graph mode

* fix eval.py and README to increase the model usability

* add new model, bmn dygraph model for video temporal proposal generation

* matching new API, decoupling model and  train module