New: (IPTorrents) Add freeleech only option

Fixes #314

src/NzbDrone.Core/Indexers/Definitions/IPTorrents.cs

@@ -181,6 +181,11 @@ namespace NzbDrone.Core.Indexers.Definitions
                 qc.Add("q", term);
             }
 
+            if (Settings.FreeLeechOnly)
+            {
+                qc.Add("free", "on");
+            }
+
             foreach (var cat in Capabilities.Categories.MapTorznabCapsToTrackers(categories))
             {
                 qc.Add(cat, string.Empty);
@@ -362,6 +367,9 @@ namespace NzbDrone.Core.Indexers.Definitions
         [FieldDefinition(2, Label = "Cookie", HelpText = "Site Cookie")]
         public string Cookie { get; set; }
 
+        [FieldDefinition(3, Label = "FreeLeech Only", Type = FieldType.Checkbox, Advanced = true, HelpText = "Search Freeleech torrents only")]
+        public bool FreeLeechOnly { get; set; }
+
         public NzbDroneValidationResult Validate()
         {
             return new NzbDroneValidationResult(Validator.Validate(this));