Update plexus-archiver to 2.2.

Lots of bug fixes eg. http://jira.codehaus.org/browse/PLXCOMP-194 , http://jira.codehaus.org/browse/PLXCOMP-149 . Suspected cause for https://issues.jenkins-ci.org/browse/JENKINS-13617 . I built the plugin locally, works as per normal on my dev environment.