pre-release 0.7.0

A lot of smaller changes happened. To see them, please check the commit history, I really don't feel like going through all of them and I don't have a tool to auto-create these changelogs. Anyways, this release is mainly to sync GitHub and Maven up - the 0.6.0 on Maven is only like 5 commits behind on master, 0.6.0 on GitHub more than 50. This release is also the first test for my dual-release action, which should automatically publish the code currently in the repo at the point of this release to Maven Central.