Added implementation and unit tests for ZipStorage.list(String)
Updated parent to v1.536 to get fix for download of zipped artifacts,
JENKINS-19752
removed debug written to standard output
Updating in line with Jesse's comments, to retrieve files in relative
paths correctly
More consistent approach to relative paths
As noted in #1, better to test against an LTS.
Cleaning up and strengthening test from #1.
[maven-release-plugin] prepare release compress-artifacts-1.1