Add tasks for all the new languages

Task/Langtons-ant/Swift/langtons-ant.swift

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+import Foundation
+
+let WIDTH = 100
+let HEIGHT = 100
+
+struct Point {
+    var x:Int
+    var y:Int
+}
+
+enum Direction: Int {
+    case North = 0, East, West, South
+}
+
+class Langton {
+    let leftTurn = [Direction.West, Direction.North, Direction.South, Direction.East]
+    let rightTurn = [Direction.East, Direction.South, Direction.North, Direction.West]
+    let xInc = [0, 1,-1, 0]
+    let yInc = [-1, 0, 0, 1]
+    var isBlack:[[Bool]]
+    var origin:Point
+    var antPosition = Point(x:0, y:0)
+    var outOfBounds = false
+    var antDirection = Direction.East
+
+    init(width:Int, height:Int) {
+        self.origin = Point(x:width / 2, y:height / 2)
+        self.isBlack = Array(count: width, repeatedValue: Array(count: height, repeatedValue: false))
+    }
+
+    func moveAnt() {
+        self.antPosition.x += xInc[self.antDirection.rawValue]
+        self.antPosition.y += yInc[self.antDirection.rawValue]
+    }
+
+    func step() -> Point {
+        if self.outOfBounds {
+            println("Ant tried to move while out of bounds.")
+            exit(0)
+        }
+
+        var ptCur = Point(x:self.antPosition.x + self.origin.x, y:self.antPosition.y + self.origin.y)
+        let black = self.isBlack[ptCur.x][ptCur.y]
+        let direction = self.antDirection.rawValue
+
+        self.antDirection = (black ? self.leftTurn : self.rightTurn)[direction]
+
+        self.isBlack[ptCur.x][ptCur.y] = !self.isBlack[ptCur.x][ptCur.y]
+
+        self.moveAnt()
+        ptCur = Point(x:self.antPosition.x + self.origin.x, y:self.antPosition.y + self.origin.y)
+        self.outOfBounds =
+            ptCur.x < 0 ||
+            ptCur.x >= self.isBlack.count ||
+            ptCur.y < 0 ||
+            ptCur.y >= self.isBlack[0].count
+
+        return self.antPosition
+    }
+}
+
+
+let ant = Langton(width: WIDTH, height: HEIGHT)
+while !ant.outOfBounds {
+    ant.step()
+}
+
+for row in 0 ..< WIDTH {
+    for col in 0 ..< HEIGHT {
+        print(ant.isBlack[col][row] ? "#" : " ")
+    }
+    println()
+}