Router in a good shape

web/components/Gallery.js

@@ -56,7 +56,7 @@ export default class Gallery extends React.Component {
                   cls += ' selected'
                 }
 
-                return <div onClick={this.onImageDotClick.bind(this, index)} className={cls}></div>
+                return <div key={img} onClick={this.onImageDotClick.bind(this, index)} className={cls}></div>
               })}
             </div>
       </div>)