Added more webdriver tests testing against a real browser.

src/components/layers/LayerList.jsx

@@ -162,6 +162,7 @@ class LayerListContainer extends React.Component {
       const groupPrefix = layerPrefix(layers[0].id)
       if(layers.length > 1) {
         const grp = <LayerListGroup
+          data-wd-key={[groupPrefix, idx].join('-')}
           key={[groupPrefix, idx].join('-')}
           title={groupPrefix}
           isActive={!this.isCollapsed(groupPrefix, idx)}
@@ -217,6 +218,7 @@ class LayerListContainer extends React.Component {
           <div className="maputnik-multibutton">
             <a
               onClick={this.toggleModal.bind(this, 'add')}
+              data-wd-key="layer-list:add-layer"
               className="maputnik-button maputnik-button-selected">
              Add Layer
             </a>