Added min_points and max_points to assignment model and forms
Added gradings_to_do array to enrollment
generated grading model
Added begin_grading route to assignments, made status helper functions in application helper
Fixed small typo in routes file (member instead of members)
Fixed gradings migration to index certain attributes. Ran the migartions
Implemented first draft of begin_grading functionality
Finished off associations for gradings
Enforced gradings to be unique
Got gradings up and running well
Added "begin grading" button to assignment's show view
Made some small bug fixes
Updated grading error to say how many submissions there are now
Made submissions only viewable by the student involved or by TA's
fixed stupid error in last commit
Added a notification when you try to access a submission that isn't yours
fixed add_grading_to_do method in enrollment
Made "begin grading" button go away after grading has begun
Made a small cosmetic change to buttons in assignments show view
begin_grading successfully assigns gradings to students