Fixing a minor bug on the display
Fix a big n+1 problem with user counts for current items on the homepage and in student index page
Disabling bullet for now. Bullet is used to highligh sql performance problems
Added a few indexes to the database to speed up retrieval when lots of records are present
Adding cache counter columns for items, students, terms and courses tables
Added a task to reset cache counters via rake
Added configurable item sources