title: Unity solution not compatible with visual studio
body: <p>Since updating to the most recent version of Unity 5.4.0f3, whenever I doubleclick on a script, it launches both Visual Studio and Monodevelop, but I get an error saying that the this version of VS (Community 2015) is unable to open my project. Monodevelop displays it's own, somewhat less clear error message. Please see the screen shots below.</p>
  
  <p>I can still manually open my script using Visual Studio's file menu, but the intellisense code completion no longer works. Anyone know how to fix this? I have Visual Studio's Tools for Unity installed.</p>
  
  <p><a href="https://i.stack.imgur.com/4we0g.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4we0g.png" alt="Visual Studio Error"></a>
  <a href="https://i.stack.imgur.com/NhXx2.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NhXx2.png" alt="Migration Report"></a></p>