Partially implemented following users

There are still some unfinished parts of following:
-Problem: you can follow a user more than once and your name will show up twice on the list
-Problem: the currently-logged-in-user object is not the same kind of object as the user-database objects, so they cannot be compared, and I did a hackjob by comparing their usernames instead
-To add: should use flash to redirect after following a user
-To add: have the follow button not be visible on your own profile
-Bug: the lists of followers and following are not showing in the user view properly. When User A follows User B, both of User B's lists contain User A, but neither of User A's lists contain User B