Include OctocatHerder::Base into OctocatHerder::PullRequest::Repo
Include OctocatHerder::Base into OctocatHerder::PullRequest::Repo

When OctocatHerder::Base was converted to a module,
OctocatHerder::PullRequest::Repo was still using it as a base class,
when it should have been including it.

jasoncodes/octocat_herder