I downloaded this project. I use VS2012. It said me that it doesnt support this type of project.
I can open SilverlightApplication and workflow projects. But i am not able to open another two projects.
I checked the cproj file and came across this
C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\Extensions\Microsoft\Dynamics CRM 2011 Developer Tools\1.0\Microsoft.Xrm.Sdk.dll
C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\Extensions\Microsoft\Dynamics CRM 2011 Developer Tools\1.0\Microsoft.Crm.Sdk.Proxy.dll
and this
And after this i suppose that you have to download this Dynamics CRM 2011 Developer Tool and Microsoft.Xrm.Sdk.
http://www.microsoft.com/en-us/download/details.aspx?id=24004 Microsoft Dynamics CRM 2011 Software Development Kit
And try check this article http://waelhamze.com/2013/06/12/building-the-crm-developer-toolkit-solution-crmpackage-in-the-cloud-tfs-online/