Adds queues._SimpleQueue (version not using semaphore mutex)
Adds queues._SimpleQueue (version not using semaphore mutex)

andresriancho/billiard,flaviogrossi/billiard,jakirkham/billiard,flaviogrossi/billiard,jakirkham/billiard,djsmith42/billiard,andresriancho/billiard,pombredanne/billiard,djsmith42/billiard,pombredanne/billiard