Indexer searching for special episodes using query string

Added SpecialEpisodeSearchCriteria criteria to handle special episode search queries
Added method NzbSearchService.SearchSpecial() for season0 episodes
Added IIndexer GetSearchUrls() for doing text based queries

src/NzbDrone.Core/IndexerSearch/Definitions/SpecialEpisodeSearchCriteria.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NzbDrone.Core.IndexerSearch.Definitions
+{
+    public class SpecialEpisodeSearchCriteria : SearchCriteriaBase
+    {
+        public string[] EpisodeQueryTitles { get; set; }
+
+        public override string ToString()
+        {
+            var sb = new StringBuilder();
+            bool delimiter = false;
+            foreach (var title in EpisodeQueryTitles)
+            {
+                if (delimiter)
+                {
+                    sb.Append(',');
+                }
+                sb.Append(title);
+                delimiter = true;
+            }
+            return string.Format("[{0} : {1}]", SceneTitle, sb.ToString());
+        }
+    }
+}