Merge pull request #17 from panesofglass/master

Update Constants and Environment to OWIN 1.1 draft spec
Merge pull request #18 from panesofglass/master

Udpate RELEASE_NOTES and add flush function.
Merge pull request #19 from panesofglass/master

Re-org and cleanup OwinApp signatures.
Convert to paket
Fix build script
Don't restrict version of Microsoft.Net.Http
Update projects for use with Xamarin and fix .gitattributes
Add FAKE and SourceLink.Fake as dependencies
Merge pull request #21 from panesofglass/paket

Use Paket