Publish at least the Microsoft.AspNet.WebApi.Client.5.2.4 package

Now we've updated this package to support .NET Standard 1.1 and remove the Microsoft.Net.Http package dependency (for that target), we should ship the new package for realz. Optionally, can publish a full set of 3.2.4 / 5.2.4 packages.

See https://www.myget.org/feed/aspnetwebstacknightly/package/nuget/Microsoft.AspNet.WebApi.Client for the latest nightly upload of this package.