title: VS2013 Is Not Compatible With VS2015 Project Type (ASP.NET Projects)
body: <p>I am using Visual Studio 2013.<br>
  But when i open the MVC project code in Github: <a href="https://github.com/betimer/Mvc" rel="nofollow">https://github.com/aspnet/Mvc</a><br>
  I found that the solution was built on the new type (project contains: xxx.xproj + xxx.json) (I think they are VS 2015 types)</p>
  
  <p>Is there any way to let my VS 2013 compatible with the new project type?</p>