Looks good to me. Shall we (git) rename "pubsubhubbub-core-0.3.xml<https://github.com/pubsubhubbub/PubSubHubbub/blob/master/pubsubhubbub-core-0.3.xml>" to "pubsubhubbub-core.xml<https://github.com/pubsubhubbub/PubSubHubbub/blob/master/pubsubhubbub-core-0.3.xml>" and then add a 0.3 tag ?
I rather use tags for versioning and keep editing the same file. Once we are happy with a 0.4 we can tag that
