Based on the feedback in the Pull request <https://github.com/boxen/our-boxen/pull/12>,
this commit implements changes to clarify how someone would customize
their Boxen setup.
Previously, the README.md file was updated but didn't match existing
Github style. This commit wraps near 80 columns (markdown links make
that a bit harder) and eliminate unnecessary steps (linking to
existing documentation and removing redundant declarations).
Previously, documentation around creating modules and using site.pp
was pretty slim. This commit adds more documentation and links to
Puppet's documentation site.
