Enable intelesense/doc-comment generation.
Loader: Fix unit tests.
Merge branch 'master' of https://github.com/loudej/owin-hosting
AppBuilder: Support pre-constructed middleware patterns.
Merge branch 'master' of https://github.com/owin/owin-hosting

Conflicts:
	src/main/Owin.Extensions/StartupExtensions.cs
Loader: Scan for the default Startup assembly in the current directory and all private bin path sub directories.
Move Owin.dll to Owin/Owin repo.
Loader: Only search the current directory if asked to (or there is no private bin).