Fix menu items on student view
Refactor RosterActivity to ClassroomActivity
Move search menu item to roster menu
Delete unused FragmentTabListener
Optimize import statements
Merge pull request #79 from teamHardwoRK/minor-fixes

Minor fixes
Style the tab bar.
Add ActionBar subtitle for each fragment
Merge pull request #80 from teamHardwoRK/minor-fixes

Add ActionBar subtitle for each fragment
Add bar chart!
change to daily scale if there is not enough data