Fix problem with group summary stats not displaying.
Integrated bootstrap on control panel. Halfway styled.
Halfway through styling facility_management.html
Coach js now works, have framework for rest of refactor
finish markup for facility_management page
Move student groups works & pagination styled.
Fixed additional summary stats bug with ungrouped students
Add minor styling to device management page
Prevent "pid ref'ed before assignment" error in cherrypy.
Align remove link
Control panel tests pass.
Convert student view to bootstrap & fix duplication bug.
Merge pull request #2131 from dylanjbarth/control_panel_ux

Control panel & fix for summary stats not showing
Merge branch 'playlists' of github.com:aronasorman/ka-lite into playlists
Add nav indicator to Tests nav link.
Remove nav indicator at test exam page so it doesn't point to the Practice nav link.
TODO: bootstrap css integration breaks the nav indicator and some input boxes.
TODO: Can select multiple exams to enable using the Enable Exam Mode button instead of just one active exam.
Bug fix for #2122 to toggle exam mode on a test and remove the display from the previous test.
separate mixins.py into separate mixin files
First commit to make 'Try Again' button more obvious per APDS's request
update playlists.json file with tags
add 'tag' playlist attribute