Collective.taskqueue

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- Fix to flush Redis pub-notifications only when queue has been emptied
to ensure that all messages will be processed
[datakurre]

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- Fix taskqueue socket to be not readable by default
[datakurre]

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- Enhance Redis-integration to connect redis notification pubsub-socket
directly to asyncore on instant message handling
[datakurre]
- Fix to require redis >= 2.4.10 [fixes 2]
[datakurre]
- Fix to not start with clear error when clearly intending to use
RedisTaskQueues without redis-dependencies. Also crash when cannot connect to
Redis. [fixes 1]
[datakurre]

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- First release for experimental use.