[maven-release-plugin] rollback the release of zxing-parent-2.3.0

git-svn-id: https://zxing.googlecode.com/svn/trunk@2966 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Remove problematic distributionManagement/site element

git-svn-id: https://zxing.googlecode.com/svn/trunk@2968 59b500cc-1b3d-0410-9834-0bbf25fbcc57