adds Bugzilla links to GitHub pull request page to bugs listed in the pull request summary
adds Bugzilla links to GitHub compare pages to bugs listed in commits
adds "Attach to bug" link to GitHub pull request page to bugs listed in pull request summary
if the pull request has been merged, adds a "Add merge comment" link to create a comment on bugs listed in the pull request summary with relevant details about the merge
This automates several things people who use GitHub for their project, but use Bugzilla for tracking issues.
