use dev. build of osmtogeojson to test new overpass geometries
refactor autorepair code into own js module

(incl. some minor improvements)
fix export to JOSM links

JSOM can't handle protocoll-less "//…" URLs, of course
use current protocol, fix improper protocol expansion
generalize export to OSM editor, add Level0
fix non-closing export dialogs
more intelligent determination of the cause of no visible data

this adds checks for ids_only and tags[_only] output of ways and relations.
also some refactoring for nicer code using lodash
use fqdn in url-shortener request

makes it possible to use external shortening services.
make overpass API and tile servers configurable in a central place

see #71
"external link" class for level0 editor
update translations
update presets
use protocol-less URL for default tile server
add make command to update maki icons
update maki icon set
add command to update "mapnik" icons
use gravitystorm's openstreetmap-carto repository for up-to-date icons
update "mapnik" icon set
fix typo in Makefile
update CHANGELOG