Follows Resource pattern (IdentityErrorDescriber.StringName, or
FormatStringName(arg1, arg2)
Also cleaned up optional services, by allowing null in constructor
SignInStatus -> SignInFailure and introduced SignInResult to make
SignInManager APIs consistent with IdentityResult (but no strings needed
for SignIn)
Fixes: #86, #176, #287 and #177
- All dependencies for RoleManager and UserManager should be required
- The old calls to GetService inside the constructors will throw instead of
returning null if left in after PR aspnet/DependencyInjection#87 is merged
Suhas Joshi
Hao Kung
Brice Lambson
Stephen Halter
Andrew Peters
Wei Wang