Turned download links into buttons
Merge branch 'master' of https://github.com/alexlo03/CodeSwap
Major overhaul oft index page
Better log messages, added capability to upload as another user when viewing assignment as admin, faculty, or ta
Students can now upload submissions, the user_id field will be automatically overwritten with their own in the controller for security.
Admins can now upload successfully as another user.
Students can revise review answers before deadline; Limit ReviewAssignments to one ReviewAssignment per Assignment
Fleshed out remaining functionality for students revising their answers
Added warning message about saved answers in chrome. Tried fixing, to no avail.