title: Netstandard.Library 1.6.1 blocked by project
body: <p>I've created a brand new solution and project in VS2017 RC and for some reason I can't use the latest version of the NETStandard.Library package.</p>
  
  <p>There's no code in the project and it's the first project in the solution.</p>
  
  <p>When in the NuGet package manager it's listed in the dropdown, but marked as blocked by project.</p>
  
  <p>Any ideas?</p>