Adding PubSub support for any PubSub service
I add some minor changes with this patch so that any PubSub service which supports xep-0060 can be used in a rudimentary way. PubSub.org doesn't work anymore and it was not xep-0060 conform. (take a look at the appended patch) Now you are able to get ATOM notifications and subscribe/unsubscribe on a node while using a pubsub service with a flat hirarchy ( pubsub.ik.nu ). Please check my changes for correctness.
Iam no python guy so i have no idea how to add creating/destroying/configuring a pubsub node, browse a pubsub hirarchy, add functionality to discover the features of a pubsub node and so on. Iam very glad to see this cool stuff in the next releases of gajim :)