[maven-release-plugin] copy for tag reef-project-0.16.1

merge in the updated version of the dev/change_version.py script

merge in the updated version of the dev/change_version.py script

merge in the updated version of the dev/change_version.py script

[maven-release-plugin] copy for tag reef-project-0.16.0

reef version 0.16

[REEF-1540] Release 0.15.1

Backport the following fixes from master to branch-0.15.1:

  * [REEF-1539] Fix memory leak in InteropUtil.cpp
  * [REEF-1528] Refactor dependency between yarn runtime and reef-webserver projects
  * [REEF-1529] Fixing reef-webserver for multi runtime

Pull Request: Closes #1106

[maven-release-plugin] copy for tag reef-project-0.15.0

Release 0.15.0-rc2

Release 0.15.0-rc1