Converted to VS2013

Hi Mark, 

I had just decided to code this myself and then I stumbled upon your project. It does exactly what I need, but I    overlooked it because it only works with VS2010. I needed it to work in 2012/2013, 

I converted it to VS2013 and made the extension work in VS2012 and VS2013 (no code changes, just configuration). I could not test if it still works in VS2010.

It would be great if you could add these changes and update the extension in the Visual Studio Gallery. This solves a problem a lot of people must have while developing nuget packages for example!

Best regards,

Peter