Fixed bug in Feed, where the well-known official NuGet feed had the wrong packages Uri.
Made a first working implementation of the UpdateUsingODataFeedAuthority, using only .NET framework bits to query the feed and to parse the JSON content. This is to slow to be really usable, but it shows the flow is working.
Changed the NuGetCLIInstaller.Factory to use the UpdateUsingODataFeedAuthority authority as a default when none is given to CreateInstaller.