[maven-release-plugin] prepare release 2.4.0
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' into prod

Conflicts:
	api/pom.xml
	core/pom.xml
	pom.xml
	shutdownhook/pom.xml
[maven-release-plugin] prepare release 2.4.0
fixed prom
fixed pom
[maven-release-plugin] prepare release 2.4.0
[maven-release-plugin] prepare for next development iteration