local
Merge branch 'master' of
https://github.com/VictorChenLi/BatonTeacherAndroid.git

Conflicts:
	src/ca/utoronto/ece1778/baton/models/StudentProfile.java
	src/ca/utoronto/ece1778/baton/screens/TalkTagFragment.java
	src/ca/utoronto/ece1778/baton/screens/WelcomeActivity.java
added GlobalApplication to store data for UI updating.
implemented talk ticket UI updating every 1 second, support multiple
user update.
added offline testing lines in MainScreenActivity