NOISSUE Add more qt versions to travis

5.0, 5.1 and 5.2 are currently marked as "allow failure". If they can be made
to pass they should be removed from this list, if not they should be removed
entirely.

tests/tst_FileSystem.cpp

@@ -1,4 +1,5 @@
 #include <QTest>
+#include <QTemporaryDir>
 #include "TestUtil.h"
 
 #include "FileSystem.h"