Change some browser.datacommons.org to datacommons.org (datacommonsor…

…g#310)

handle hash change to support re-render when the link on home page is…

… clicked (datacommonsorg#262)

* handle on hash change

* move listenHashChange to timelineParams

Fix a null data reference issue (datacommonsorg#228)

* Fix a null data reference issue

* Fix an error

Tag website release from Jul 23, 2020.

Fix timeline links on homepage (datacommonsorg#146)

* fix timeline links on homepage
* Fix spelling mistake with multi grouped bar charts on place pages