Move UserProfile and Registration out of courseware and into a renamed auth (now user)

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

courseware/module_render.py

@@ -19,7 +19,8 @@ from django.template import Context
 from django.template import Context, loader
 from mitxmako.shortcuts import render_to_response, render_to_string
 
-from models import StudentModule, UserProfile
+from models import StudentModule
+from user.models import UserProfile
 import track.views
 
 import courseware.content_parser as content_parser