Removed references to Persona auth provider

Author: jacobawenger

tests/lib/MockFirebase.js

@@ -1483,10 +1483,6 @@
         out.email = '[email protected]';
         out.md5_hash = MD5(out.email);
         break;
-      case 'persona':
-        out.email = '[email protected]';
-        out.md5_hash = MD5(out.email);
-        break;
       case 'twitter':
         out.accessToken = 'ACCESS_TOKEN'; //todo
         out.accessTokenSecret = 'ACCESS_TOKEN_SECRET'; //todo