Aiobook

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* Added:
* **setup.py**: long description
* Changed:
* **FacebookHandler.get_defined_handlers()**: it returns tuple now
* Fixed:
* **FacebookHandler.get_allowed_handlers()**: doesn't work
* **README.md**: several mistypings

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* Fixed:
* **Messenger.send()**: "allowed types" was unallowed
* **setup.py**: pip install didn't install package correctly
* **README.md**: several mistypings

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* **Initial release**
* Added:
* Facebook event handler
* Send API functionality
* Types for send API (Templates, Buttons, Elements, Quick Replies)
* AioBookApp wrapper