Add apache http client
hard code poc for posting to vallu
Send hard coded xml payload
Variables name changed
Change content type to xml
Merge pull request #208 from finnishtransportagency/vallu-xml-sender

Vallu xml sender
Do not move asset when road links are not shown
Fix transaction boundary in `updateAsset`
Reduce sent events when trying to move asset if road links are not visible
Declare shared zoom levels in a shared file
Remove unused function parameter
Add object to generate vallu store stop change message
Add asset external id to vallu xml message
Add stop element to vallu message
Add administrator stop id to vallu stop change message
Rename value
Merge branch 'master' of https://github.com/finnishtransportagency/digi-road-4