Added login page.
Added logout button.
Added Save button on four year plan.
Added 6 class limit on four year plan.
Improved style on schedule (sort of).
Added color indicator next to class on schedule.
Merge branch 'master' into gh-pages

* master:
  Added login page. Added logout button. Added Save button on four year plan. Added 6 class limit on four year plan. Improved style on schedule (sort of). Added color indicator next to class on schedule.