Get a list of groups the auth'd user can post photos to.

def groups_pools_getGroups():
    """Get a list of groups the auth'd user can post photos to."""
    method = 'flickr.groups.pools.getGroups'
    data = _doget(method, auth=True)
    groups = []
    if isinstance(data.rsp.groups.group, list):
        for group in data.rsp.groups.group:
            groups.append(Group(group.id, name=group.name, \
                                privacy=group.privacy))
    else:
        group = data.rsp.groups.group
        groups = [Group(group.id, name=group.name, privacy=group.privacy)]
    return groups