Dependency version range testing

It would be useful to have a test scaffolding (within the project or in a separate project) that can test gadget chains against **multiple versions of each dependency**, ideally including JRE versions. This can be useful to:
- establish a range bracket for each dependency used by a gadget chain in which it works
- continuously test each gadget chain against its established dependency version brackets to look for regressions
- discover gadget class `serialVersionUID` incompatibilities across dependency version boundaries

https://github.com/yyuu/capistrano-jdk-installer and/or http://ftp-nyc.osuosl.org/pub/jenkins/updates/updates/hudson.tools.JDKInstaller.json may be useful for JRE version testing