Have Selenium properly wait for page load
Have Selenium properly wait for page load

Have Selenium properly wait for the Binder page to load to trigger the
Binder build. Just using time.sleep is not necessarily sufficient. This
is done following the example at
http://www.obeythetestinggoat.com/how-to-get-selenium-to-wait-for-page-load-after-a-click.html

scikit-hep/uproot,scikit-hep/uproot,scikit-hep/uproot,scikit-hep/uproot