Happy to announce that SNAPSHOTs are now automatically built. It is integrated with travis and when travis says (tag) commit is ok, it builds jsprit and pushes it to packagecloud (https://packagecloud.io/graphhopper/jsprit/). You just need to add this to your pom:
Look here how easy it is to install jsprit with deb, rpm, python, gem.
Release are still pushed to Maven Central.