Fixing ES6 modules

Author: CarterLi

src/angular-gridster.js

@@ -8,7 +8,7 @@
 		define(['angular', 'resize-observer-polyfill'], factory);
 	} else if (typeof exports === 'object') {
 		// CommonJS
-		module.exports = factory(require('angular'), require('resize-observer-polyfill'));
+		module.exports = factory(require('angular'), require('resize-observer-polyfill').default);
 	} else {
 		// Browser, nothing "exported". Only registered as a module with angular.
 		factory(root.angular, window.ResizeObserver);