finish mixpanel wrap.
[yanan] sevral changes to 1.room API 2.loadingIcon 3.angular on start display problem
Merge pull request #3 from longchao/master

minor UI change (label)
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'upstream/master'
many bugfix
Base Version 2.0
fix some bug
[yanan] for merge
Merge remote-tracking branch 'upstream/master'
soome modify
change dl route
Merge branch 'master' of https://github.com/SunshineLibrary/mothership
[yanan] dashboard logic ready for release
Merge remote-tracking branch 'upstream/master'
[yanan] change jump logic from exercise to navigator (dashboard)
[longchao] final ui change