Add tasks for all the new languages

Task/Quickselect-algorithm/Swift/quickselect-algorithm.swift

@@ -0,0 +1,20 @@
+func select<T where T : Comparable>(var elements: [T], n: Int) -> T {
+  var r = indices(elements)
+  while true {
+    let pivotIndex = partition(&elements, r)
+    if n == pivotIndex {
+      return elements[pivotIndex]
+    } else if n < pivotIndex {
+      r.endIndex = pivotIndex
+    } else {
+      r.startIndex = pivotIndex+1
+    }
+  }
+}
+
+for i in 0 ..< 10 {
+  let a = [9, 8, 7, 6, 5, 0, 1, 2, 3, 4]
+  print(select(a, i))
+  if i < 9 { print(", ") }
+}
+println()