Merge pull request dotnet#202 from AArnott/fix197

Return exit code 3 from SignClient when no files will be signed

Merge pull request dotnet#133 from dotnet/client-fixes

Client fixes

Merge pull request dotnet#125 from dotnet/client-globbing

Add globbing support and concurrency.

Use FileMode.Create to ensure we do't leave parts of an existing file…

… in case of overwrite

add comment

Use sync copy

Add runtime config file until https://github.com/dotnet/core-setup/is…

…sues/6420 is done

Use latest SDK to build

Merge pull request dotnet#54 from onovotny/desc-url-fix

Desc url fix

Merge pull request dotnet#40 from onovotny/client-updates

Add a better error message if it's a bad user/pass