User interface polish

* Remove City, State, and Zip from the popup content
* Update the GeoJSON data to include school phone number and
  grades and show these fields in the popup.
* Change link text in popup to "See more detail".
* Decrease initial zoom level to 13 so more markers are visible
  in initial display on small screens.
* Allow setting of center and zoom level with element
  "data-attributes".
* Allow generation of map when no preset is specified.

Addresses https://pm.theworkdept.com/issues/3949#note-6
Add example of overriding preset options.

Addresses https://pm.theworkdept.com/issues/3949#note-6
Different popup content on hover and click

Only show the school name on hover.  Show the full popup content
on click.

Adds preset options ``showPopupOnHover`` and ``hoverPopupTemplate``
to configure this behavior.

Addresses https://pm.theworkdept.com/issues/3949#note-6
Update minified js from 3a3a585253c37f72ec2f8998fa03217578e6c864