add tooltip to show all groups (broken)
second attempt at groups tooltip
invite-teachers tooltip
Merge branch 'master' into tooltips

* master:
  Add django-storages and boto to requirements.
add tooltips for group/teacher/student multiselect
Get tooltips working
Fix locked selectbox tooltips
Merge branch 'master' into tooltips

* master:
  Don't try to use fully qualified URLs in tests; custom BASE_URL confuses it.
  update jquery-history.js
reduce js code duplication
Fix last-in-list teacher-select tooltips
Merge branch 'master' into tooltips

* master:
  Make the profile-edit admin page handle scale better.
  Not quite so many gunicorn workers.
  More gunicorn worker processes.