Import of working code base

Signed-off-by: martin f. krafft <madduck@madduck.net>
diff --git a/mergers/list/set.py b/mergers/list/set.py
new file mode 100644
index 0000000..ddb0eb4
--- /dev/null
+++ b/mergers/list/set.py
@@ -0,0 +1,17 @@
+#
+# -*- coding: utf-8 -*-
+#
+# This file is part of reclass (http://github.com/madduck/reclass)
+#
+# Copyright © 2007–13 martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+from extend import BaseListMerger
+
+class SetExtend(BaseListMerger):
+
+    def _combine(self, first, second):
+        for i in second:
+            if i not in first:
+                first.append(i)
+        return first