Start an utility method to retrieve the member of a group `get_user_of_group`
Expand _get_pkgdb2_packagers_for to include the members of a group if the group has ACLs
get_user_of_group requires access to the fedmsg config
Add logic to instantiate an AccountSystem object if there isn't already one
If the package has a group with some ACL, get the AccountSystem client and forward the configuration
Adjust the structure of the FAS credential per @ralphbean's advice
pep8.
Typofix.
Apply group-ownership stuff to packages-of-user in addition to packagers-of-package.
Merge pull request #16 from fedora-infra/feature/group_maintainer

Feature/group maintainer