- New upstream release of 0.6.4.
    - Catch exceptions.IOError whenever we do a low-level yum call. Resolves
        #577549
    - Do not abort if the package-id is not unique in the reposet
    - Ensure the lock failure message is proper unicode. Resolves #585620
    - Ensure we catch the exception if there are no groups. Resolves #587196
    - Ensure we create /var/cache/PackageKit if the user nukes it
    - Get the correct state for each update. Resolves #574658