title: VS2015 nuget package manager not finding packages
body: <p>I installed VS2015 Update 2 and now nuget package manager does not find any packages outside of the "Microsoft and .net" package source. It looks like the nuget package source was removed. When I add it back as "<a href="http://www.nuget.org">http://www.nuget.org</a>" I get an error "Unable to retrieve results from one or more sources".</p>
  
  <p>Anyone else having this problem?</p>