Add assets hidden if asset validity period is not currently selected
Show asset only if zoom levels is correct when validity period changes
Show asset when adding it on the layer if validity period permits
Filter only tram stops out when exporting data to Vallu
Merge pull request #256 from finnishtransportagency/filter-only-tram-stops-in-vallu-export

Filter only tram stops out when exporting data to Vallu
Revert site structure cleanup in order to fix the map cross hair
Merge branch 'master' of github.com:finnishtransportagency/digiroad2 into stop_name_to_front_end