[#64650014] Backport Ruby Trollop gem from Ubuntu Utopic to Precise

Check in the source package for Ubuntu Utopic's Ruby Trollop and backport it to Ubuntu Precise.

This is a dependency of Hiera eYAML, which I'll also be backporting in a future PR.

Source package downloaded from:
http://archive.ubuntu.com/ubuntu/pool/universe/r/ruby-trollop/ruby-trollop_2.0-1.debian.tar.xz
It would be a good idea to update the maintainer to be yourself.  The original maintaner can be added to an `XSBC-Original-Maintainer` field (eg https://github.com/alphagov/packager/blob/master/pkg/golang/debian/control#L5-L6)