Fix README datatables source location
First year of operation is a single select
Make "First year of operation" a range slider
Encourage user to multi-select
Disable some filtering console.log
Fix 1999/2000 bug in filtering first year
Pin library versions of gmaps and jquery-ui

* jQuery UI wasn't pinned, so breaking API changes broke e.g. Tabs event API
* Unpinned GMaps was OK, but still concerning, so it's pinned to v3.
Comment out the "missing geocode" console.log
Defer map initialization until after its tab is visible

http://stackoverflow.com/questions/1428178/problems-with-google-maps-api-v3-jquery-ui-tabs

"Any component that requires some dimensional computation for its
initialization won't work in a hidden tab, because the tab panel itself is
hidden via display: none so that any elements inside won't report their actual
width and height (0 in most browsers)."