[maven-release-plugin] prepare release zxing-parent-2.3.0

git-svn-id: https://zxing.googlecode.com/svn/trunk@2957 59b500cc-1b3d-0410-9834-0bbf25fbcc57
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://zxing.googlecode.com/svn/trunk@2959 59b500cc-1b3d-0410-9834-0bbf25fbcc57