Command wrapper

A command wrapper for people who already have a directory like ~/bin in the search
path and who would like to use Ansible from the Git checkout without much
shell integration (like having to run env-setup).

(One-time) setup information is in the README file.

Ideally, this can depend on the merging of the `env-setup-shell-tweaks` branch, in which case the shebang line of the wrapper script should be changed to `/bin/sh`.