Updating to reflect EF fluent API chaining change.
Updating release Nuget.config
Updating dev Nuget.config
Fix SignIn params order.
Clean up sign in manager

- Add SignInOptions
- Also fix SecurityStampValidator issue resolving against wrong service
collection
UseUserNameAsEmail support

When set:
- FindByEmail will use UserName
- SetEmail will set the user name and email
- GetEmail will return user name
- This setting does not impact the Get/Set/FindUserName apis
Change IUserClaimStore to take IEnumerable<Claims>

https://github.com/aspnet/Identity/issues/163
Add missing merge conflict file
Login changes
Refactor tests to all share UserManagerTestBase
Cleanup unit tests
Collapse unit tests into TestBase