React to hosting changes
Disable tests for now

Filed https://github.com/aspnet/MusicStore/issues/292
Revert "Disable tests for now"

This reverts commit 0d7c28413f40ec5002b4cfe6721c08e8c38fcd31.
Remove use of context.Configuration
React to identity changes
Add schema version to kproj files
Corresponding changes for changing AssociatedMetadataProvider's interface
Fixed tests to run on Mono
Using .Include in queries instead of manual joining

Also removed Identity setup from Ntlm Startup
Some minor using statements ordering.