Fixed import new series being stuck in a loop if an update failed

Seperated IndexerProviderTest from ProviderTests
Fixed some ToString() issues
Refactored IndexerBase/IndexerProvider

NzbDrone.Web/Controllers/SystemController.cs

@@ -26,7 +26,7 @@ namespace NzbDrone.Web.Controllers
 
         public ActionResult Indexers()
         {
-            return View(_indexerProvider.All());
+            return View(_indexerProvider.GetAllISettings());
         }