Revert "Disabled the ProjectFactory type"

This reverts commit 9d1f321 - bad branch :P

src/CommandLine/Commands/ProjectFactory.cs

@@ -4,69 +4,13 @@
 using System.Linq;
 using System.Runtime.Versioning;
 using System.Xml.Linq;
-#if SUPPORTED_ON_MONO
 using Microsoft.Build.Evaluation;
 using Microsoft.Build.Execution;
 using Microsoft.Build.Framework;
 using Microsoft.Build.Logging;
-#endif
 using NuGet.Common;
 
 namespace NuGet.Commands {
-#if !SUPPORTED_ON_MONO
-	class Project 
-	{
-		public Project (string path)
-		{}
-	}
-
-	class ProjectFactory : IPropertyProvider
-	{
-		public bool IncludeSymbols {
-			get { throw GetNotSupported (); }
-			set { throw GetNotSupported (); }
-		}
-
-		public Dictionary<string, string> Properties {
-			get { throw GetNotSupported (); }
-		}
-
-		public bool IsTool {
-			get { throw GetNotSupported (); }
-			set { throw GetNotSupported (); }
-		}
-
-		public ILogger Logger {
-			get { throw GetNotSupported (); }
-			set { throw GetNotSupported (); }
-		}
-
-		public PackageBuilder CreateBuilder ()
-		{
-			throw GetNotSupported ();
-		}
-
-		public ProjectFactory (string path)
-		{
-			throw GetNotSupported ();
-		}
-
-		public ProjectFactory (Project project)
-		{
-			throw GetNotSupported ();
-		}
-
-		dynamic IPropertyProvider.GetPropertyValue (string propertyName)
-		{
-			throw GetNotSupported ();
-		}
-
-		NotSupportedException GetNotSupported ()
-		{
-			return new NotSupportedException ("At this point Mono lacks implementation of the Microsoft.Build assembly and the ProjectFactory command is not available.");
-		}
-	}
-#else
     internal class ProjectFactory : IPropertyProvider {
         private readonly Project _project;
         private FrameworkName _frameworkName;
@@ -604,5 +548,4 @@ private class ReverseTransformFormFile : IPackageFile {
             }
         }
     }
-#endif
 }