create elasticsearch dumps
Merge branch 'continuous-updates' of https://github.com/komoot/photon into continuous-updates

Conflicts:
	src/main/java/de/komoot/photon/importer/elasticsearch/Updater.java
Merge branch 'continuous-updates' of https://github.com/komoot/photon into continuous-updates
add missing maven dependency
Merge branch 'continuous-updates'
documentation, tiding up, error messages, ...