Pyramid-scheduler

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* Added support for alternate specification of job execution via
`scheduler.delegator` config

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* Improved "async" jobs to run immediately instead of relying on
APScheduler (thus improving time-to-execution)

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* Removed `distribute` dependency

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* Fix for Python 3 support
(thanks to github.com/farvour -- issue 7)

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* Added Python 3 support
(thanks to github.com/farvour -- issue 3)
* Implemented workaround for kombu (python3 + pickle + bzip2) issue

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* Added ultra-basic unit test
* Fixed serializer to work with kombu 3.0.8
(thanks to github.com/mazvv -- issue 2)