Add tasks for all the new languages

Task/Sierpinski-carpet/Swift/sierpinski-carpet.swift

@@ -0,0 +1,17 @@
+import Foundation
+func sierpinski_carpet(n:Int) -> String {
+    func middle(str:String) -> String {
+        let spacer = str.stringByReplacingOccurrencesOfString("#", withString:" ", options:nil, range:nil)
+        return str + spacer + str
+    }
+
+    var carpet = ["#"]
+    for i in 1...n {
+        let a = carpet.map{$0 + $0 + $0}
+        let b = carpet.map(middle)
+        carpet = a + b + a
+    }
+    return "\n".join(carpet)
+}
+
+println(sierpinski_carpet(3))