added wait in test case

Author: Nils Langner

test/integration/tests/acceptance/SimpleCept.php

@@ -6,5 +6,6 @@
 $I->seeVisualChanges("SimpleBlock", "#theblock");
 
 // the test has to be called twice for comparison on the travis server
+$I->wait(2);
 $I->amOnPage("/VisualCeption/seeVisualChanges.php");
 $I->seeVisualChanges("SimpleBlock", "#theblock");