Github-PR-115 by mpdeimos: findByXXX does not accept orderBy/limit/offset

Our modification to pass findByXXX functions orderBy/limit/offset params for entity repositories like one is used from normal findBy function.

We're using an if cascade in favor of the call_user_function_array since the latter is considered as slow.

PS: If i need to target this pull request to your master, I'll resubmit - it's just that we're building against a stable codebase.

Reference link: https://github.com/doctrine/doctrine2/pull/115