I now show the name of the trailhead at the destination instead of
showing the lat/long at the destination.
Deleted mapPage from index.html and commented all the code that isn't
needed when I call Googla Maps directly instead of using the API.
Had to change trails.json to have "Turkeypen and South ..." instead of
"Turkeypen & South ..." because Google Maps choked on the ampersand.
Eliminated all of the globals except trailId.
Deleted some big sections of code that had been commented.
Deleted buildStepArray().
Deleted calculateRoute().
Deleted initializeMapAndCalculateRoute().
Deleted locSuccess() and locError().
Deleted insertDistance() and zoomToStep().
Deleted functions for mapPage.
Deleted .refresh click.
Removed all extraneous functions.  Lots of console.log() statement must
still be removed.