Use ostree_repo_pull_default_console_progress_changed()

Remove redundant function _rpmostree_pull_progress().

Bumped ostree requirement to 2014.13, but this isn't quite right because
we actually need (unreleased) 2014.14.  Post-release version bumps would
be useful here.
Merge pull request #77 from mbarnes/pull-progress

Use ostree_repo_pull_default_console_progress_changed()