Merge tag '2.1.1' into develop

Rel

* tag '2.1.1':
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release halbuilder-core-2.1.1
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release halbuilder-core-2.1.1
[maven-release-plugin] prepare release halbuilder-core-3.0.1
[maven-release-plugin] prepare for next development iteration
Merge branch 'release/3.0.1'

* release/3.0.1:
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release halbuilder-core-3.0.1