Generate stable package versions

Generate packages with versions as 3.1.1.

Bump version to 2.2.2

Bump the providers' version to 2.2.2.

Ensure email claim is set (aspnet-contrib#411)

Set the ClaimTypes.Email claim from the email in the JWT if present and an email is not received as a parameter with the sign in.

Ensure Apple email claim is set for .NET Core 2 (aspnet-contrib#412)

* Ensure Apple email claim is set for .NET Core 2

* Removed C# 8 code.

Ensure the aspnet-contrib signing key is always used for strong naming

Remove version suffix

Remove the version suffix to generate 2.2.0 packages.

Add SourceLink support

Add support for SourceLink in the compiled binaries.

Update version.props to build 2.0.1 packages

Update version.props to build 1.0.1 packages

Update version.props to build 2.0.0 packages