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

git-svn-id: https://zxing.googlecode.com/svn/trunk@2954 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Remove site plugin causing release problems

git-svn-id: https://zxing.googlecode.com/svn/trunk@2955 59b500cc-1b3d-0410-9834-0bbf25fbcc57