Formatted all scores to be accepted as strings and muliplied by 100 to be able to round score more accurately
Rosters dsplay their avg score
Added methods to query database for certain data to be sent to a javascript chart. Also added a max_score column to grade and a total_score column to student.
Added Cards for TA's on course view
Added partial for assistants card. May not be railsy though...
Added some additional formatting to assitant cards
Added a link to the new user form on the courses show. Added new and create actions
Send Assistant invite DONE
Merge branch 'roster-show'

Conflicts:
	db/schema.rb