Responses are session ready

Responses now are ready to receive session data and support the
various apis for handling them. Still have to address the cryptographic
signing and the persisting/reading to and from cookies.
Merge branch 'master' into sessions
Sessions are writable

Sessions are writable but i still have to make them readable.
Merge branch 'master' into sessions
got readable sessions now
Merge pull request #17 from blackboxsociety/sessions

Sessions