Add tasks for all the new languages

Task/Combinations/Swift/combinations.swift

@@ -0,0 +1,20 @@
+func addCombo(prevCombo: [Int], var pivotList: [Int]) -> [([Int], [Int])] {
+
+  return (0..<pivotList.count)
+    .map {
+      _ -> ([Int], [Int]) in
+      (prevCombo + [pivotList.removeAtIndex(0)], pivotList)
+    }
+}
+func combosOfLength(n: Int, m: Int) -> [[Int]] {
+
+  return [Int](1...m)
+    .reduce([([Int](), [Int](0..<n))]) {
+      (accum, _) in
+      accum.flatMap(addCombo)
+    }.map {
+      $0.0
+    }
+}
+
+println(combosOfLength(5, 3))