Add tasks for all the new languages

Task/Short-circuit-evaluation/Swift/short-circuit-evaluation.swift

@@ -0,0 +1,26 @@
+func a(v: Bool) -> Bool {
+  print("a")
+  return v
+}
+
+func b(v: Bool) -> Bool {
+  print("b")
+  return v
+}
+
+func test(i: Bool, j: Bool) {
+  println("Testing a(\(i)) && b(\(j))")
+  print("Trace:  ")
+  println("\nResult: \(a(i) && b(j))")
+
+  println("Testing a(\(i)) || b(\(j))")
+  print("Trace:  ")
+  println("\nResult: \(a(i) || b(j))")
+
+  println()
+}
+
+test(false, false)
+test(false, true)
+test(true, false)
+test(true, true)