Move consumer classes from bin.huey_consumer to huey.consumer

This should make it easier to create Consumers in code without relying on the
huey_consumer script.
Fix consumer tests
Remove logging-related parameters from Consumer __init__
ConsumerThread: Sleep when huey is non-blocking, not the other way round
Merge pull request #56 from jbaiter/consumer_module

Refactor consumer-code into separate module
Fix django consumer after consumer refactoring.
py3k fixes.
Travis
Thread fixes for py3k
Fix for unicode responses in tests w/redis.
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