Add tasks for all the new languages

Task/Perfect-numbers/Swift/perfect-numbers.swift

@@ -0,0 +1,15 @@
+func perfect(n:Int) -> Bool {
+    var sum = 0
+    for i in 1..<n {
+        if n % i == 0 {
+            sum += i
+        }
+    }
+    return sum == n
+}
+
+for i in 1..<10000 {
+    if perfect(i) {
+        println(i)
+    }
+}