Plugapi

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Fixed a bug completely breaking the server
(Replaced ``None.startswith with`` ``"".startswith`` for default ``Content-Type``
and passed empty params and cookies to the ``Request`` constructor)

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Fixed a bug where ``/`` would not work

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- Added URL params (``/:id/:uuid`` for example)
- Added ``attachment`` and ``includeFilename`` in ``FileResponse``
- Added ``RedirectResponse`` and ``JSONPResponse``
- Changed ``RequestType`` to ``RequestMethod`` and made name changes as
such
- Added error handling for rogue malformed requests
- Added documentation

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Added ``multipart_middleware``, ``url_encoded_middleware``,
``cors_middleware``