Added tiered indexer requests to support fallback to wildcard queries.

src/NzbDrone.Core/Indexers/IndexerPageableRequest.cs

@@ -0,0 +1,25 @@
+using System.Collections;
+using System.Collections.Generic;
+
+namespace NzbDrone.Core.Indexers
+{
+    public class IndexerPageableRequest : IEnumerable<IndexerRequest>
+    {
+        private readonly IEnumerable<IndexerRequest> _enumerable;
+
+        public IndexerPageableRequest(IEnumerable<IndexerRequest> enumerable)
+        {
+            _enumerable = enumerable;
+        }
+
+        public IEnumerator<IndexerRequest> GetEnumerator()
+        {
+            return _enumerable.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return _enumerable.GetEnumerator();
+        }
+    }
+}