Spade

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* Added statement to relinquish the cpu at each behaviour loop.
* Message Thread is now stored as metadata for simplicity.

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* Added JSON responses in web module.
* Some improvements in aiothread management.

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* Added coroutines to start agents from within other agents.
* Improved API doc format.

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* Rename internal templates to avoid conflicts.
* Added API doc.
* Minor bug fixes.

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* Fixed presence notification updates.
* Fixed FSM graphviz visualization.
* Raise AuthenticationFailure Exception when user is not registered or user or password is wrong.
* Import init improvements.
* Attribute auto_register is now default True.
* Improved documentation.
* Other minor fixes.

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* Minor doc fixings and improvements.