Release 0.7.6

This release (0.7.6) is a stepping stone to 0.8 and comes with most of the features planned for 0.8. However, there still are some rough edges so 0.7.5 remains our latest stable.

New features, bug fixes and backward compatibility of this release are documented by PR #275 and also detailed in the release notes. As usual, you can pull a Docker image for this release from DockerHub.