Merge branch 'master' into dev

.gitignore

.travis.yml

README.md

convlab2/__init__.py

convlab2/dialog_agent/env.py

convlab2/dst/evaluate.py

convlab2/dst/sumbt/.gitignore

convlab2/dst/sumbt/BeliefTrackerSlotQueryMultiSlot.py

convlab2/dst/sumbt/crosswoz_en/.gitignore

convlab2/dst/sumbt/crosswoz_en/__init__.py

convlab2/dst/sumbt/crosswoz_en/convert_to_glue_format.py

convlab2/dst/sumbt/crosswoz_en/sumbt.py

convlab2/dst/sumbt/crosswoz_en/sumbt_config.py

convlab2/dst/sumbt/crosswoz_en/sumbt_utils.py

convlab2/dst/sumbt/multiwoz/sumbt.py

convlab2/dst/sumbt/multiwoz/sumbt_config.py

convlab2/dst/sumbt/multiwoz_zh/.gitignore

convlab2/dst/sumbt/multiwoz_zh/__init__.py

convlab2/dst/sumbt/multiwoz_zh/convert_to_glue_format.py

convlab2/dst/sumbt/multiwoz_zh/sumbt.py