takes a gem manifest file and is able to fetch, download, and install the gems
and all child dependencies specified in this manifest. It can manage any update
to the gem manifest file and update the bundled gems accordingly. It also
letsyou run any ruby code in context of the bundled gem environment.
WWW: http://github.com/wycats/bundler
PR: ports/140355
Submitted by: Robert Gogolok <gogo at cs.uni-sb.de>