Enable live bus map view

[leonardehrenfried]

DT1 has live bus display on the map.

The feature is has quite a few problems (very slow updates, unknown lines...) but we'd like to develop it further and get going with a first version.

Therefore get the code from 37f0df7 and apply it to the next branch.

Please also copy the look of the popup from here: https://github.com/stadtnavi/digitransit-ui/blob/master/app/component/map/VehicleMarkerContainer.js#L171-L199

[derhuerst]

I had trouble with using transitime/TheTransitClock, so I asked the maintainer: TheTransitClock/transitclockDocker#12