[maven-release-plugin] prepare release chemistry-opencmis-0.12.0-RC1

git-svn-id: https://svn.apache.org/repos/asf/chemistry/opencmis/trunk@1617569 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/chemistry/opencmis/trunk@1617571 13f79535-47bb-0310-9956-ffa450edef68