libgit2/rugged — pull request #66 by brianmario (2012-06-10 18:25:58+00:00)
Title: Add ability to access oids of some associated objects

This adds the following methods to access oids directly without needing to load new Ruby objects only to use the oid.

`Rugged::Tag#target_oid`
`Rugged::Commit#tree_oid`
`Rugged::Commit#parent_oids`