Reacting to CLR package versioning changes
Update Identity to account for DataProtection changes.
Updating System.Text.RegularExpressions version
React to options and hosting changes
Reacting to provider-specific EF API changes
Fix typo in samples
Rationalize IdentityDbContext ctors

Also clean up unit tests
Delete renamed file
React to DI change for GetService
Change GetService calls to GetRequiredService

GetRequiredService throws for missing services like GetService used to.
Initial working sample
Updated to latest DI changes