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
Avoiding some unused headers
Running code cleanup and code analysis
Sorting suppressions
Reorganizing, and implementing some opt-in defacto header support

static helper code for http method override and forwarded headers

extension methods for helper code in different namespace

apply helper code enables site author to modify environment when
needed for overrides to apply to fwks that don't look for them by
default