Get one workgroup member.

def get(self, wg_uuid, uuid, tree=False):
        """ Get one workgroup member."""
        url = "%(base)s/%(wg_uuid)s/nodes/%(uuid)s" % {
            'base': self.local_base_url,
            'wg_uuid': wg_uuid,
            'uuid': uuid
        }
        param = {}
        if tree:
            param['tree'] = True
        encode = urllib.urlencode(param)
        if encode:
            url += "?"
            url += encode
        return self.core.get(url)