Remove warnings

Make resque warnings free :cactus: 

There's only one warn coming from redis-namespace, I've filled PR for it already: https://github.com/defunkt/redis-namespace/pull/51

In some places, in tests, I've used silence warnings for convenience. There were warnings about redefined methods in classes that were defined in runtime for test purposes so it's ok to silence them.

Tests green and clean. Yo!