Merge branch 'hotfix/wrong-mapping-request-to-facade-remove_todo'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
all *.py file passed pep8 test
clean up reqirements.txt
Merge branch 'develop'
Update README.md
merge develop
Merge branch 'develop'
bugfix: syntax err [ng-controller=AppController
Merge branch 'develop'
bugfix: make move_todo always return None (implict/explic)
Merge branch 'develop'
fix: keypress not work
fix: the order of new poped todo should be the largest