Bumping version
Roughing in Owin.AutoStartup concept
Roughing in Owin.Types and UseOwin extension
Minor fixes

Property typo
Sources nuspec shouldn't be copied to output
Adjusting type names

Request/Response -> OwinEnvironment/OwinRequest/OwinResponse
Adding typed properties and methods for spec keys
Adding req/res header helpers, making partial struct internal
Combining files in source packages
Fixing some typos and unused usings
Enable intelesense/doc-comment generation.