Moved NancyOwinHost to Nancy core
Added extensions for the new delegate-based approach (IBuilder.UseOwin etc.)
Added missing documentation
Renamed NancyOwinHost to NancyMiddleware
(re)moved using statements
Merge pull request #1544 from khellang/owin

Move NancyOwinHost to core.
Ignoring case for Secure or HttpOnly sections of the cookie header.
Merge pull request #1562 from DarrellMozingo/CaseInsensitiveCookies

Ignoring case for Secure or HttpOnly sections of the cookie header.