Parsely

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* [Feature] Reorganize structure. Public interface of producer is changed.
* [Feature] SQLite3 isn't required.

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* [Feature] Set StreamHandler as default handler of the logger.
* [Feature] Log task names.
* [Feature] Log received message.

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* [Feature] Option to disable database logging.
* [Feature] Remove log level option. Provide other way.

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* Rename project Brokkoly to Parsely.

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* [Feature] Delay option
* [Feature] Retry option
* [Fix] Function names are duplicated in Celery.

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* [Feature] Task list on the web interface.
* [Feature] Queue list on the web interface.