Merge pull request #403 from ruijunhuang2010/master

update
Merge pull request #404 from ruijunhuang2010/master

derive total number of days for habit challenge creation
Merge pull request #405 from ruijunhuang2010/master

derive total number of days when edit habit challenge
Merge pull request #25 from ChrisBoesch/master

update
Merge pull request #406 from ruijunhuang2010/master

Resume challenge game from accepted challenges
format
quest selection debug #2
Merge pull request #407 from LI-HE/master

quest selection debug #2
optimize for IE login
Merge pull request #408 from LI-HE/master

optimize for IE login
Merge pull request #16 from ChrisBoesch/master

update