Add transfer controller and model, remove database model and transfer responsabilities

models/User.php

@@ -26,6 +26,16 @@ namespace models;
             return $this->_select_one('user', ['email' => $email]);
         }
 
+        /**
+         * Return users by transfer status.
+         *
+         * @param bool $transfer : transfer status
+         */
+        public function gets_by_transfer($transfer)
+        {
+            return $this->_select('transfer', ['transfer' => $transfer]);
+        }
+
         /**
          * Return list of user.
          *