Changed the Is404 property on the doc request to be set by the last chance lookup, not by the module

because in the future if people override the last chance lookup, they might not want it to be 404, it will
be up to them.

src/Umbraco.Web/UmbracoModule.cs

@@ -100,11 +100,15 @@ namespace Umbraco.Web
 					httpContext.Response.Redirect(docreq.RedirectUrl, true);
 				//set the culture on the thread
 				Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture = docreq.Culture;
-				//find the document
-				searcher.LookupDocument();
+				//find the document, found will be true if the doc request has found BOTH a node and a template
+				var found = searcher.LookupDocument();
 				//redirect if it has been flagged
 				if (docreq.IsRedirect)
 					httpContext.Response.Redirect(docreq.RedirectUrl, true);
+				
+				//TODO: Here I think we need to put the logic in to do what default.aspx is doing for the most part, 
+				// especially assigning the pageID of the httpcontext so we can render macros in MVC 
+
 				//if no doc is found, send to our not found handler
 				if (docreq.Is404)
 				{
@@ -113,6 +117,7 @@ namespace Umbraco.Web
 				else
 				{
 					//TODO: Detect MVC vs WebForms
+					
 					var isMvc = true;
 					RewriteToUmbracoHandler(HttpContext.Current, uri.Query, isMvc);
 				}