Downgrade release-plugin for now

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Bump pom-scijava to 1.117-test to test deploying to OSS Sonatype

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add license/developers section, required by OSS Sonatype

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>