Gocept.amqprun

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- Renamed decorator from ``handle`` to ``declare``.
- Added helper method ``wait_for_response`` to MainTestCase.
- Added an IProcessStarting event which is sent during startup.
- Added the <amqp:writefiles/> directive that sets up a handler that writes
incoming messages into files.
- Added handling of <logger> directives

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- Added a decorator ``gocept.amqprun.handler.handle(queue_name, routing_key)``.

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- first release.