fix #154 Button now goes back to over state when setFrames used in action

src/gameobjects/Button.js

@@ -197,7 +197,7 @@ Phaser.Button.prototype.setFrames = function (overFrame, outFrame, downFrame) {
         {
             this._onDownFrameName = downFrame;
 
-            if (this.input.pointerOver())
+            if (this.input.pointerDown())
             {
                 this.frameName = downFrame;
             }
@@ -206,7 +206,7 @@ Phaser.Button.prototype.setFrames = function (overFrame, outFrame, downFrame) {
         {
             this._onDownFrameID = downFrame;
 
-            if (this.input.pointerOver())
+            if (this.input.pointerDown())
             {
                 this.frame = downFrame;
             }