merge mongo with master

model/DbDriver.php

@@ -38,7 +38,7 @@ abstract class DbDriver
         $required = array('database', 'username', 'password', 'hostname');
         foreach ($required as $option) {
             if (!isset($config[$option])) {
-                throw new Exception('Configuration must have a "' . $option . '".');
+                throw new GeneralException('Configuration must have a "' . $option . '".');
             }
         }
     }