Remove incredibly useless comment

I actually can't think of a more useless comment in the history of
comments
Create view decorator to simplify object-getting

Still not entirely sure if this is a good idea but we'll see. It may end
up being too much of a performance drag. IDK.

Closes #203, though not in the way I expected. Also closes #30, finally.

**NEEDS TESTS**
Reorder imports in views/main.py (now alphabetic)
Add course creation link to standard 404 page

Since the custom 404 page for courses has been canned.