title: .net core (csproj) global.json 'projects' equivalent
body: <p>With .net core (project.json) I used to switch between nuget packages and source code by adding the path to source code to the <code>projects</code> field in the global.json. After I did that it would add all the projects that it could find in that path that could replace the nuget packages I referenced. </p>
  
  <p>I used this feature alot because I have my own nuget packages that I use, but I want to test the changes in my other project before I publish. But once I switched to Sdk 1.0.0/VS 2017/csproj .net core that feature seemed to disappear.</p>
  
  <p>The alternative is just manually adding each project, switch the references manually (since they are broken up  into project, nuget and sdk references), and then after switch it all back.</p>
  
  <p>Any thoughts or advice would be great.</p>
  
  <p><strong>UPDATE:</strong>
  Sounds like there is no equivalent in csproj (as expected), but there are msbuild workarounds for now (As of the initial VS 2017/.NET Core SDK 1.0.0 release)</p>