Added grid without data into rosters show
grid for roster DONE
Added some sick logic to display a link to grade a particular eval or to show the final score
One tweak to link_or_grade method. Also added total score column
Fixed appearance of final score
Made a grade editable from the roster
Created method to average the grades on a particular eval in a particular roster
Added method to roster to return a descending array of final scores on a particular eval
Added scrolling table finally!
Merge branch 'real-rostershow'

Conflicts:
	app/assets/stylesheets/application.css.scss