update call to getMock to createMock

tests/Storm/Test/SaveHooksTest.php

@@ -26,7 +26,7 @@ THE SOFTWARE.
 
 class Storm_Test_SaveHooksTest extends Storm_Test_ModelTestCase {
   public function setUp() {
-    $this->trace_hook_mock = $this->getMock('TraceHookMock', array('beforeSave', 
+    $this->trace_hook_mock = $this->createMock('TraceHookMock', array('beforeSave',
                                                                    'afterSave',
                                                                    'loaderSave'));