Added timer to explore v2 and share it with sqllab (#1802)

* Added timer to explore v2 and share it with sqllab

* Fixed js tests

* Add timer to initial load

* Make timer smaller

* nits

superset/assets/javascripts/explorev2/components/ExploreViewContainer.jsx

@@ -30,6 +30,7 @@ class ExploreViewContainer extends React.Component {
 
   componentDidMount() {
     window.addEventListener('resize', this.handleResize.bind(this));
+    this.props.actions.updateChartStatus('success');
   }
 
   componentWillReceiveProps(nextProps) {