Renamed all Core.Controllers to Core.Providers to avoid confusion between Core Controllers and MVC controllers

NzbDrone.Core/Providers/IDownloadProvider.cs

@@ -0,0 +1,10 @@
+using NzbDrone.Core.Repository;
+
+namespace NzbDrone.Core.Providers
+{
+    public interface IDownloadProvider
+    {
+        bool AddByUrl(ItemInfo nzb); //Should accept something other than string (NzbInfo?) returns success or failure
+        bool IsInQueue(Episode episode);//Should accept something other than string (Episode?) returns bool
+    }
+}