Merge pull request #9 from mcalmer/master

Cleanup
Merge pull request #10 from mcalmer/master

use --oldpackage to support downgrade.
Implement cache_only flag for future actions
bring back the --oldpackage flag
Merge pull request #11 from openSUSE/dmacvicar_wip_cache_only

Implement cache_only flag for staging content of future actions
bump version and update changelog