[IPhone] Update LazyTableImages sample to cope with http compression

Apple recently enabled gzip compression on the rss feed which the normal
webclient class does not cope with.

LazyTableImages/AppDelegate.cs

@@ -79,7 +79,7 @@ namespace LazyTableImages {
 			UIApplication.SharedApplication.NetworkActivityIndicatorVisible = true;
 			
 			// Retrieve the rss feed from the server
-			var downloader = new WebClient ();
+			var downloader = new GzipWebClient ();
 			downloader.DownloadStringCompleted += DownloadCompleted;
 			downloader.DownloadStringAsync (RssFeedUrl);
 		}

LazyTableImages/GzipWebClient.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Net;
+
+namespace LazyTableImages
+{
+	public class GzipWebClient : WebClient
+	{
+		protected override WebRequest GetWebRequest (Uri address)
+		{
+			var request = base.GetWebRequest (address);
+			if (request is HttpWebRequest)
+				((HttpWebRequest) request).AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
+			return request;
+		}
+	}
+}
+

LazyTableImages/LazyTableImages.csproj

@@ -73,6 +73,7 @@
     </Compile>
     <Compile Include="App.cs" />
     <Compile Include="RssParser.cs" />
+    <Compile Include="GzipWebClient.cs" />
   </ItemGroup>
   <ItemGroup>
     <InterfaceDefinition Include="RootViewController.xib" />