Removed un-needed WebClient from XbmcProvider.

BackLog Provider created.
QueueIfWanted moved to new class (RssItemProcessingProvider) to cutdown on repeating code (between RssSyncProvider and BacklogProvider)
Style.css now sets width for rootDirectories class (when adding a new show).

NzbDrone.Web/Content/style.css

@@ -239,6 +239,11 @@ input[type="text"]:hover
 /* Add Series */
 
 .tvDbSearchResults
+{
+    width: 400px;
+}
+
+.rootDirectories
 {
     width: 400px;
 }