Upgraded solution to vs2013, also added Json.fs back and fixed reference...

...s to Json.Net so the project built.

For some reason Json.fs wasn't in the Enterprise.fsproj file which was preventing RabbitMQ and Web from building.  Once I added that back in (and added a reference to the Json.NET NuGet package) it began building again.  If that's not how you intended for the projects to reference the nuget package let me know and I'll get it changed.