Add support for multiple messages per contact #13
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This sadly complicates our lua/redis queuing even more, but it is the only way I've figured out how to satisfy both max transactions per second on channels as well as fair queueing across channels, having priorities AND spacing out messages on the same contact by a set amount of time. (currently that is at least 5 seconds [could be more depending on what is in the queue but shouldn't be if we set priorities smartly])
Typical push and pop are still in the .15ms range so performance still seems ok.