Allow to specify version

[diethardsteiner]

Please add a -v flag to specify the version of the tools to install. This is useful in cases when the build should have consistently the same setup (e.g. there are changes between various versions which might impact the dashboards. As long as a dashboard is tested with one specific version and the results are all fine [Dashboards are rendering as expected], I'd like to keep using this specific version in my CBF builds.)