Maps: use labels instead of tooltips

[timwis]

A fellow in Leaflet's gitter showed me how he's used L.tooltip for labels:

Tooltip options:

{permanent: true}

And styles:

.leaflet-tooltip {
    background: none;
    box-shadow: none;
    border: none;
}
.leaflet-tooltip-left:before, .leaflet-tooltip-right:before {
    border: 0px;
}

And to prevent overlapping labels, we can use Geovation/labelgun. Woot!