Merge in the latest from master

src/main/scala/com/codecommit/antixml/Zipper.scala

@@ -110,13 +110,7 @@ trait Zipper[+A <: Node] extends Group[A] with IndexedSeqLike[A, Zipper[A]] with
               (Map[Int, Int]() /: maps) { _ ++ _ }
             }
 
-            val initialMap = Map[Int, Set[Int]]((0 to result.size).toSeq flatMap { i =>
-              childMap get(i) match {
-                case Some(s: Set[Int]) if s.size == 0 => Some((i, s))
-                case _ => None
-              }
-            } :_*)
-            val (_, aggregate, childMap2) = result.slice(from, to).zipWithIndex.foldLeft((0, Vector[B](), initialMap)) {
+            val (_, aggregate, childMap2) = result.slice(from, to).zipWithIndex.foldLeft((0, Vector[B](), Map[Int, Set[Int]]())) {
               case ((start, acc, childMap2), (chunk, i)) => {
                 val size = chunk.size
                 val source = inverseMap(i)