[maven-release-plugin] prepare release org.apache.sling.event-3.4.4

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1636620 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1636622 13f79535-47bb-0310-9956-ffa450edef68
SLING-4132 - fixed event listeners registration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1636636 13f79535-47bb-0310-9956-ffa450edef68