title: Missing packages.config file
body: <p>I'm trying to do something with .NET core in VS2017 RC, but I noticed the packages.config is missing, because they default in defining dependency in the project file.
  However my configuration look like this:
  <a href="https://i.stack.imgur.com/cGEFN.png" rel="noreferrer"><img src="https://i.stack.imgur.com/cGEFN.png" alt="enter image description here"></a>
  so apparently it should use the file. Apparently it does not honour that configuration.
  Furthermore,
  Is there some reason we should prefer the dependency in the project file anyway?</p>