Merge pull request #6 from ChrisBoesch/master

update
update the controller for dnd
Merge pull request #39 from LI-HE/master

update the controller for dnd
format the dirty code
Merge pull request #40 from LI-HE/master

format the dirty code
Merge pull request #27 from ChrisBoesch/master

update
minor update on selection

affected pages are controller and selecquest
Merge pull request #28 from ChrisBoesch/master

update
resolved practice drag and drop game
Merge pull request #41 from ruijunhuang2010/master

update
change default practice game to beginner python
Merge pull request #42 from ruijunhuang2010/master

update
Merge pull request #4 from ChrisBoesch/master

update 08/06