Invert displayed scale for very high zoom levels
Invert displayed scale for very high zoom levels

This prevents a scale of '1 : 0' being displayed and instead displays
'scale : 1'

bjornharrtell/ol3,ahocevar/openlayers,bjornharrtell/ol3,openlayers/openlayers,ahocevar/openlayers,openlayers/openlayers,stweil/openlayers,openlayers/openlayers,ahocevar/openlayers,stweil/openlayers,bjornharrtell/ol3,stweil/openlayers