Roll back to 2.3.0-SNAPSHOT again

git-svn-id: http://zxing.googlecode.com/svn/trunk@2944 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Careful with clean target and pom files

git-svn-id: http://zxing.googlecode.com/svn/trunk@2945 59b500cc-1b3d-0410-9834-0bbf25fbcc57
[maven-release-plugin] prepare release zxing-parent-2.3.0

git-svn-id: http://zxing.googlecode.com/svn/trunk@2946 59b500cc-1b3d-0410-9834-0bbf25fbcc57