Merge branch 'master' of git://github.com/zts/Gitalist

* 'master' of git://github.com/zts/Gitalist:
  Fixed tests.
  Reorganisation of ::Project.
  Rename Object->contents to ->content, and delegate to GPP.
  Removed unused methods on Project.
  Make Project->heads an attribute.
  More tidying of ::Project.
  Add a branch to the test repository.
  Fixed signature for references.
  Trivial comment change.