checkpoint:  added the OwinHost projects back in, seeded Katana, starting very slowly to work up new Cookie support
mapping the expires and httponly parts of a cookie
checkpoint:  can round trip Cookie from text to object to text
checkpoint:  implemented the new methods on ICurrentHttpRequest
checkpoint:  introduced HeaderValueSource, making all hosts use it, changed REquestDataHeaders to use the new headers
checkpoint:  compiling again after changing up ICookies
basic rake is clean, fixed cookie binding
all integration tests are passing
switched the integration tests to using Katana
integration tests completely passing against Katana
nuspec changes for Katana/OwinHost.  Closes GH-470, Closes GH-468, Closes GH-467
added the '_about' endpoint for development mode.  Closes GH-466
closes GH-464