Some refactoring to decouple web based assemblies from Umbraco.Core and move whatever we can to Umbraco.Web where web based assemblies are used. Decouples System.Drawing entirely from Umbraco.Core and removes the Active Directory dependency from Umbraco.core.

src/Umbraco.Web/Install/Controllers/InstallController.cs

@@ -6,6 +6,7 @@ using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Migrations.Install;
 using Umbraco.Web.Security;
+using Umbraco.Web.UI.JavaScript;
 
 namespace Umbraco.Web.Install.Controllers
 {