Re-raise an integrity error during user creation if it's not caused by something we know to check for

Catch user integrity errors, and then try and figure out what caused them (which removes a race condition)

Re-raise an integrity error during user creation if it's not caused by something we know to check for

Catch user integrity errors, and then try and figure out what caused them (which removes a race condition)

Allow anonymous user access to the site. Requires guest_courses.xml and info/guest_updates.html to be set created in the data repository

Moved site, is_secure, etc. into render_to_string shortcut, and fixed bugs in the shortcut. We should test this pretty well, since this touches a lot of templates

--HG--
branch : pmitros-name-change

--HG--
branch : pmitros-name-change

--HG--
branch : pmitros-name-change

--HG--
branch : pmitros-name-change

--HG--
branch : dormsbee_performance

--HG--
rename : user/__init__.py => student/__init__.py
rename : user/migrations/0001_initial.py => student/migrations/0001_initial.py
rename : user/migrations/0002_text_to_varchar_and_indexes.py => student/migrations/0002_text_to_varchar_and_indexes.py
rename : user/migrations/__init__.py => student/migrations/__init__.py
rename : user/models.py => student/models.py
rename : user/tests.py => student/tests.py
rename : user/views.py => student/views.py

--HG--
rename : auth/__init__.py => user/__init__.py
rename : auth/tests.py => user/tests.py
rename : auth/views.py => user/views.py