Merge pull request #38 from georgejhunt/lower

normalize username to lock password

Author: minrk

firstuseauthenticator/firstuseauthenticator.py

@@ -138,7 +138,7 @@ def validate_username(self, name):
 
     @gen.coroutine
     def authenticate(self, handler, data):
-        username = data['username']
+        username = self.normalize_username(data['username'])
 
         if not self.create_users:
             if not self._user_exists(username):