This patch adds the ability to validate syntax of manifests, templates,
and ruby files in lib/ via `rake validate` and the linting of manifests
with puppet-lint via `rake lint`. These two commands are chained with
running the spec tests in Travis to ensure there are no syntax or style
issues.
This updates the Rakefile and spec_helper to use the common versions
available in the puppetlabs_spec_helper rubygem branch. This mostly
just removes a bunch of duplicated code, but it also gives us more
flexibility in how the module is tested in the future.
