Gserver

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*BugFix* - Fixed an issue with the way cookies were being set

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*Feature* - Can set the response code via the ``Request`` object

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*Feature* - Can set ``Content-Type`` to ``None`` to avoid adding the header

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*BugFix* - Fixed http exceptions classes (copy and paste errors :S)

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*BugFix* - Broke the ``callback`` functionality, during JSON requests, with the 0.1a4 release

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*Feature* - Added ``exceptions.py`` so that you can throw errors from handlers.
This is much like Djangos raise Http404.
Currently only 404's are implemented.

Added ``request.py`` to wrap gevents WSGI ``Environment`` and
``start_response`` variables and provide additional functionality
(adding cookies, redirects..)

Added more comments