feat(plan): Add class name option for add button
feat(osrm): Add function to download routing as gpx
feat(plan): Replace marker icon options with createMarker function

BREAKING CHANGE: The option waypointIcon will not be used
feat(osrm): Add support for uturns at markers.
refactor(itinerary): Rename variable to fit description better
Merge branch 'TheMarex-missing-osrm-features'

Close #50.