Ignore ref_name (snippets, 22e4a24)

Ignore ref_name for now seeing as it is not used for any real purpose. If I
later decide to take specific actions depending on the reference name (for
example, distinguishing between unannotated tags, annotated tags, branch
commits and tracking branch events, as demonstrated in the post-receive-email
hook that comes with Git) I can always do something with the ref_name.

Signed-off-by: Greg Hurrell <greg@hurrell.net>\