Tweaking for sonatype.
Add gpg signing.
Merge branch 'develop' into feature/CentralPublishing
Merge branch 'develop' into feature/CentralPublishing
Merge branch 'develop' into feature/CentralPublishing
Merge branch 'develop' into feature/CentralPublishing
Merge branch 'develop' into feature/CentralPublishing
Improve github docs.
TODO for gpg.
Merge branch 'feature/CentralPublishing' into develop