Fixes skipping of parent classes

Should fix this issue: #529

This will always perform the check for $suiteClassName inside loaded classes
I don't think that `$testCaseQueue` describes the property appropriately. The array contains all classes that were discovered when loading a test case, which may include additional (non-test-case) utility classes.

I'd call it something like `$discoveredClasses` or `$unprocessedClasses`.