In the previous commit, the metadata.json file was changed to have
puppet as a dependency rather than a requirement. This caused the
module to try to install puppet from the Forge which was not the
desired behavior for many reasons. Therefor, update the metadata
file to use requirements instead of dependencies.
Since we don't want the name of the tool to reflect the fact that
it is using yard internally (this is an implementation detail), rename
the face to `strings`. Now when one wishes to generate documentation,
`puppet strings` will be used rather than `puppet yardoc`.
Alex Dreyer