Greenrocket

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* Added ``Signal.afire()`` method that returns awaitable to support
coroutine-based signal handlers
* Dropped Python 2.6 and 3.2 support

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* Added `Watchman` class as a testing helper

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* Removed distribute dependency
* Improved tests

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* Changed handler subscription mechanism from subscription by reference to
subscription by weak reference

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* Fixed logger loose on program termination

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* Initial release