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

Tests/sprites/create sprite 1.js

@@ -10,6 +10,5 @@
         //  This will create a Sprite positioned at the top-left of the game (0,0)
         //  Try changing the 0, 0 values
         game.add.sprite(0, 0, 'bunny');
-        game.camera.texture.alpha = 0.5;
     }
 })();