Add tasks for all the new languages

Task/Fibonacci-sequence/Swift/fibonacci-sequence-1.swift

@@ -0,0 +1,12 @@
+import Cocoa
+
+func fibonacci(n: Int) -> Int {
+    let square_root_of_5 = sqrt(5.0)
+    let p = (1 + square_root_of_5) / 2
+    let q = 1 / p
+    return Int((pow(p,CDouble(n)) + pow(q,CDouble(n))) / square_root_of_5 + 0.5)
+}
+
+for i in 1...30 {
+    println(fibonacci(i))
+}

Task/Fibonacci-sequence/Swift/fibonacci-sequence-2.swift

@@ -0,0 +1,11 @@
+func fibonacci(n: Int) -> Int {
+    if n < 2 {
+        return n
+    }
+    var fibPrev = 1
+    var fib = 1
+    for num in 2...n {
+        (fibPrev, fib) = (fib, fib + fibPrev)
+    }
+    return fib
+}

Task/Fibonacci-sequence/Swift/fibonacci-sequence-3.swift

@@ -0,0 +1,9 @@
+func fibonacci() -> SequenceOf<UInt> {
+  return SequenceOf {() -> GeneratorOf<UInt> in
+    var window: (UInt, UInt, UInt) = (0, 0, 1)
+    return GeneratorOf {
+      window = (window.1, window.2, window.1 + window.2)
+      return window.0
+    }
+  }
+}

Task/Fibonacci-sequence/Swift/fibonacci-sequence-4.swift

@@ -0,0 +1,9 @@
+func fibonacci(n: Int) -> Int {
+    if n < 2 {
+        return n
+    } else {
+        return fibonacci(n-1) + fibonacci(n-2)
+    }
+}
+
+println(fibonacci(30))