[maven-release-plugin] prepare release org.apache.aries.blueprint.core-1.2.0

git-svn-id: https://svn.apache.org/repos/asf/aries/trunk@1528548 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/aries/trunk@1528550 13f79535-47bb-0310-9956-ffa450edef68