Change api to return ListedAsset objects that do not contain property data.

This was done to optimise performance on the front-end. During asset rendering most of the time was spent waiting for data from the backend.
Update submodule
Enable gzip compression for Scalatra REST api
Change api to reload and return updated asset when modifying asset properties.
Merge branch 'master' of https://github.com/finnishtransportagency/digiroad2 into optimize_asset_fetching
Merge branch 'master' of https://github.com/finnishtransportagency/digiroad2 into optimize_asset_fetching
Use validity direction and image ids directly from asset and read values from updated asset returned by api.

Also fixed several bugs related to asset property saving.
Merge branch 'master' of https://github.com/finnishtransportagency/digiroad2 into optimize_asset_fetching

Conflicts:
	digiroad2-oracle
	src/main/scala/fi/liikennevirasto/digiroad2/Digiroad2Api.scala
Use authorized municipalities in roadlinks service
Reload assets after saving all properties to db
Remove both directions value for validity directions
Remove both directions value for validity directions
Merge branch 'master' of https://github.com/finnishtransportagency/digiroad2 into optimize_asset_fetching

Conflicts:
	UI/src/bundles/digiroad2/bundle/mapbusstop/plugin/BusStopLayerPlugin.js
	digiroad2-oracle
Merge pull request #104 from finnishtransportagency/optimize_asset_fetching

Optimize asset fetching
Add script to import data from conversion
Refer latest digiroad2-oracle version
List removed from event because not needed
Merge branch 'master' of https://github.com/finnishtransportagency/digi-road-2
Reused _getSelectedLayer
Use authorized municipalities in roadlinks service