Merge pull request #165 from Nazin/patch-1

interface compatibility

lib/Doctrine/DBAL/Connections/MasterSlaveConnection.php

@@ -242,10 +242,10 @@ class MasterSlaveConnection extends Connection
     /**
      * {@inheritDoc}
      */
-    public function rollback()
+    public function rollBack()
     {
         $this->connect('master');
-        return parent::rollback();
+        return parent::rollBack();
     }
 
     /**