Merge branch 'emoUS' into 'github_master'

.gitignore

convlab/dialog_agent/agent.py

convlab/dialog_agent/env.py

convlab/evaluator/multiwoz_eval.py

convlab/nlu/jointBERT/multiwoz/nlu.py

convlab/policy/USMDA/evaluate.py

convlab/policy/USMDA/example.py

convlab/policy/USMDA/predict.py

convlab/policy/USMDA/train.py

convlab/policy/emoUS/analysis.py

convlab/policy/emoUS/dialogue_collector.py

convlab/policy/emoUS/emoUS-BertNLU-RuleDST-RulePolicy.json

convlab/policy/emoUS/emoUS.py

convlab/policy/emoUS/emotion.json

convlab/policy/emoUS/emotion_eval.py

convlab/policy/emoUS/evaluate.py

convlab/policy/emoUS/self_bleu.py

convlab/policy/emoUS/sent2emo.json

convlab/policy/emoUS/sentiment.json

convlab/policy/emoUS/token_map.py