Move verification key generation to view

Instead of creating the email verication key on the db
model as a default for the field, create it in the
registration view.
Now all verification key generation is only in
auth/views.py!

mediagoblin/auth/views.py

@@ -84,6 +84,7 @@ def register(request):
             user.email = email
             user.pw_hash = auth_lib.bcrypt_gen_password_hash(
                 request.POST['password'])
+            user.verification_key = unicode(uuid.uuid4())
             user.save(validate=True)
 
             # log the user in

mediagoblin/db/mongo/models.py

@@ -15,7 +15,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import datetime
-import uuid
 
 from mongokit import Document
 
@@ -88,7 +87,6 @@ class User(Document):
         'created': datetime.datetime.utcnow,
         'email_verified': False,
         'status': u'needs_email_verification',
-        'verification_key': lambda: unicode(uuid.uuid4()),
         'is_admin': False}
 
     def check_login(self, password):