Replace deprecated icon with embedded image

This change fixes the build in Visual Studio 2012 and Visual Studio 2013.

Additional information:

* [Problems upgrading VSPackage to VS2012](http://social.msdn.microsoft.com/Forums/vstudio/en-US/79977334-5642-454f-b9b9-a607f6c03d4c/problems-upgrading-vspackage-to-vs2012)
* [How to: Migrate VSPackages to Visual Studio 2012](http://msdn.microsoft.com/en-us/library/vstudio/cc512930.aspx)