Added more webdriver tests testing against a real browser.

src/components/layers/LayerListGroup.jsx

@@ -5,6 +5,7 @@ import Collapser from './Collapser'
 export default class LayerListGroup extends React.Component {
   static propTypes = {
     title: PropTypes.string.isRequired,
+    "data-wd-key": PropTypes.string,
     isActive: PropTypes.bool.isRequired,
     onActiveToggle: PropTypes.func.isRequired
   }
@@ -12,6 +13,7 @@ export default class LayerListGroup extends React.Component {
   render() {
     return <li className="maputnik-layer-list-group">
       <div className="maputnik-layer-list-group-header"
+        data-wd-key={"layer-list-group:"+this.props["data-wd-key"]}
         onClick={e => this.props.onActiveToggle(!this.props.isActive)}
       >
         <span className="maputnik-layer-list-group-title">{this.props.title}</span>