Updated DocumentRequest so that it doesn't actually do the searching, it acts more like a model.

The DocumentSearcher now performs the searching and sets the properties on the DocumentRequest, this
simplifies the dependencies between the contexts. Updated the LookupByNiceUrlTests unit test, now all
initialization is working and the test runs which will be the basis for testing all of the IDocumentLookups.

src/Umbraco.Web/UmbracoModule.cs

@@ -64,6 +64,7 @@ namespace Umbraco.Web
 			var niceUrls = new NiceUrlProvider(contentStore, umbracoContext);
 			//create the RoutingContext
 			var routingContext = new RoutingContext(
+				umbracoContext,
 				DocumentLookupsResolver.Current.DocumentLookups,
 				LastChanceLookupResolver.Current.LastChanceLookup,
 				contentStore,
@@ -83,8 +84,8 @@ namespace Umbraco.Web
 				//Create a document request since we are rendering a document on the front-end
 
 				// create the new document request which will cleanup the uri once and for all
-				var docreq = new DocumentRequest(uri, umbracoContext);
-				//assign the routing context to the umbraco context
+				var docreq = new DocumentRequest(uri, routingContext);
+				//assign the document request to the umbraco context now that we know its a front end request
 				umbracoContext.DocumentRequest = docreq;
 
 				// note - at that point the original legacy module did something do handle IIS custom 404 errors
@@ -95,14 +96,21 @@ namespace Umbraco.Web
 				//   to trigger Umbraco's not-found, one should configure IIS and/or ASP.NET custom 404 errors
 				//   so that they point to a non-existing page eg /redirect-404.aspx
 
-				docreq.LookupDomain();
+				//create the searcher
+				var searcher = new DocumentSearcher(docreq);
+				//find domain
+				searcher.LookupDomain();
+				//redirect if it has been flagged
 				if (docreq.IsRedirect)
 					httpContext.Response.Redirect(docreq.RedirectUrl, true);
+				//set the culture on the thread
 				Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture = docreq.Culture;
-				docreq.LookupDocument();
+				//find the document
+				searcher.LookupDocument();
+				//redirect if it has been flagged
 				if (docreq.IsRedirect)
 					httpContext.Response.Redirect(docreq.RedirectUrl, true);
-
+				//if no doc is found, send to our not found handler
 				if (docreq.Is404)
 				{
 					httpContext.RemapHandler(new DocumentNotFoundHttpHandler());