Create SystemCenterEndpointProtection2012R2.admx

Based on the original ADMX/ADML available from http://www.microsoft.com/en-US/download/details.aspx?id=13088 (fep2010grouppolicytools-en-us), updated with System Center Endpoint Protection 2012 R2 strings. Microsoft SpyNet is also changed to Microsoft Active Protection Service (MAPS).