Fix handling of base class.
Fix handling of base class.

Asana/kazoo,bsanders/kazoo,max0d41/kazoo,kormat/kazoo,kormat/kazoo,max0d41/kazoo,python-zk/kazoo,rockerbox/kazoo,jacksontj/kazoo,jacksontj/kazoo,tempbottle/kazoo,harlowja/kazoo,rockerbox/kazoo,tempbottle/kazoo,python-zk/kazoo,rackerlabs/kazoo,AlexanderplUs/kazoo,rgs1/kazoo,pombredanne/kazoo,rackerlabs/kazoo,harlowja/kazoo,pombredanne/kazoo,bsanders/kazoo,rgs1/kazoo,AlexanderplUs/kazoo