[maven-release-plugin] prepare release core-2.2

git-svn-id: https://zxing.googlecode.com/svn/trunk@2769 59b500cc-1b3d-0410-9834-0bbf25fbcc57
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://zxing.googlecode.com/svn/trunk@2771 59b500cc-1b3d-0410-9834-0bbf25fbcc57