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

user/models.py

@@ -0,0 +1,52 @@
+"""
+WE'RE USING MIGRATIONS!
+
+If you make changes to this model, be sure to create an appropriate migration
+file and check it in at the same time as your model changes. To do that,
+
+1. Go to the mitx dir
+2. ./manage.py schemamigration users --auto description_of_your_change
+3. Add the migration file created in mitx/courseware/migrations/
+"""
+import uuid
+
+from django.db import models
+from django.contrib.auth.models import User
+
+class UserProfile(models.Model):
+    class Meta:
+        db_table = "auth_userprofile"
+
+    ## CRITICAL TODO/SECURITY
+    # Sanitize all fields. 
+    # This is not visible to other users, but could introduce holes later
+    user = models.ForeignKey(User, unique=True, db_index=True)
+    name = models.TextField(blank=True, db_index=True)
+    language = models.TextField(blank=True, db_index=True)
+    location = models.TextField(blank=True, db_index=True)
+    meta = models.TextField(blank=True) # JSON dictionary for future expansion
+    courseware = models.TextField(blank=True, default='course.xml')
+
+
+class Registration(models.Model):
+    ''' Allows us to wait for e-mail before user is registered. A
+        registration profile is created when the user creates an 
+        account, but that account is inactive. Once the user clicks
+        on the activation key, it becomes active. '''
+    class Meta:
+        db_table = "auth_registration"
+
+    user = models.ForeignKey(User, unique=True)
+    activation_key = models.CharField(('activation key'), max_length=32, unique=True, db_index=True)
+
+    def register(self, user):
+        # MINOR TODO: Switch to crypto-secure key
+        self.activation_key=uuid.uuid4().hex
+        self.user=user
+        self.save()
+
+    def activate(self):
+        self.user.is_active = True
+        self.user.save()
+        self.delete()
+