Merge branch 'master' into dev

Dockerfile

README.md

convlab2/__init__.py

convlab2/dialog_agent/agent.py

convlab2/dialog_agent/session.py

convlab2/dst/evaluate.py

convlab2/dst/sumbt/BeliefTrackerSlotQueryMultiSlot.py

convlab2/dst/sumbt/README.md

convlab2/dst/sumbt/multiwoz/sumbt.py

convlab2/evaluator/evaluator.py

convlab2/evaluator/multiwoz_eval.py

convlab2/nlg/template/multiwoz/manual_user_template_nlg.json

convlab2/nlg/template/multiwoz/nlg.py

convlab2/policy/evaluate.py

convlab2/policy/rule/multiwoz/policy_agenda_multiwoz.py

convlab2/policy/rule/multiwoz/rule.py

convlab2/policy/rule/multiwoz/rule_based_multiwoz_bot.py

convlab2/task/multiwoz/generate_goals.py

convlab2/task/multiwoz/goal_generator.py

convlab2/util/analysis_tool/analyzer.py