The YARD plugin is currently architected using `require_relative` so that it
can be loaded outside of Puppet. Unfortunately, `require_relative` first
appeared in Ruby 1.9.1.
Achieve compatibility using the Backports gem.
Use `require_relative` for all components under Puppetx. This makes it possible
to load `pupetx/yardoc/yard/plugin` outside of Puppet as a YARD plugin.
Also fix the `yardoc` face so that Puppetx bits are loaded _after_ feature
checks.
Start building a YARD parser. Parsing and comment extraction has been moved out
of the yardoc face and into the new `Puppetx::Yardoc::YARD::PuppetParser`
class. The old `Commentor` class from the Util module has been renamed to
`Puppetx::Yardoc::Pops::YARDTransformer`.
`puppet yardoc` is still capable of extracting docstrings for node, class and
type definitions from a single manifest file.
Charlie Sharpsteen