Merge pull request cocos2d#2264 from VisualSJ/5938-UIButton

Issue #5938: Add getTitleRenderer to UIButton

Author: dingpinglv

extensions/ccui/uiwidgets/UIButton.js

@@ -735,6 +735,15 @@ ccui.Button = ccui.Widget.extend(/** @lends ccui.Button# */{
         this.pressedActionEnabled = enabled;
     },
 
+    /**
+     * Get the title renderer.
+     * title ttf object.
+     * @returns {cc.LabelTTF}
+     */
+    getTitleRenderer: function(){
+        return this._titleRenderer;
+    },
+
     /**
      * Sets title text to ccui.Button
      * @param {String} text