Update Constants and Environment to OWIN 1.1 draft spec
Merge pull request #17 from panesofglass/master

Update Constants and Environment to OWIN 1.1 draft spec
Udpate RELEASE_NOTES and add flush function.
Merge pull request #18 from panesofglass/master

Udpate RELEASE_NOTES and add flush function.
Re-org and cleanup OwinApp signatures.
Merge pull request #19 from panesofglass/master

Re-org and cleanup OwinApp signatures.
more refactoring in prep for a better cors story!
complete, essentially, content negotiation headers
more headers, etc.
inlining functions currently theoretically complete
all currently implemented decisions inlined
Convert to paket
Fix build script
Don't restrict version of Microsoft.Net.Http
accept negotiation
tidying, commentary...
more harmonious naming, plus more implementation of conneg. abbrevs for common modules
commentary!
http tweaks
better organisation of http lib