Cleanup whitespace, order of imports in some files

Purely cosmetic
Resize faculty images

There's really no reason to have them more than 3 times the required
size.
Change profile URL from user/ to users/

Because the get_absolute_url method on django.contrib.auth.model.User
has users/ hardcoded for some reason and this is the easiest way to get
around it (without having to resort to absolute URL overrides)

Might break some links in Google search results but since the entire
site has been down for the past few days that's probably not the
biggest thing to worry about right now
Add contributions sidebar, views for user profiles

Got rid of the list of recent pages from the main user profile and
replaced it with a sidebar containing links to contribution-related
pages
Show timestamp on hover when using get_timesince

Affected: dashboard, recent activity, recently-edited courses,
contributions. Reason: sometimes being able to see the actual time is
nice.
Replace YAML fixtures with JSON

Closes #159 yay
Merge branch 'master' of github.com:dellsystem/wikinotes