Added the new Button game object and various other input and tilemap fixes.

Tests/sprites/alpha.js

@@ -0,0 +1,15 @@
+/// <reference path="../../Phaser/Game.ts" />
+(function () {
+    var game = new Phaser.Game(this, 'game', 800, 600, init, create);
+    function init() {
+        //  Using Phasers asset loader we load up a PNG from the assets folder
+        game.load.image('bunny', 'assets/sprites/bunny.png');
+        game.load.start();
+    }
+    var bunny;
+    function create() {
+        //  Here we'll assign the new sprite to the local smallBunny variable
+        bunny = game.add.sprite(0, 0, 'bunny');
+        bunny.alpha = 0.5;
+    }
+})();