Replace User.get_profile() with dedicated model look-ups.
The user profile module is officially deprecated, and User.get_profile() is

going away in Django 1.7. Just because it's deprecated doesn't make our Profile

model obsolete, it just means we need to do the queries manually.
There's nothing in Review Board itself that causes problems here. In fact,

while I was in here I found some cases where we were using User.get_profile()

where we really wanted Profile.objects.get_or_create(), to ensure that the

profile object existed.

Ran unit tests
Smoke tested the UI