Inserted a  time span which may be an change in the past in order to be published.
Inserted tests for the special page 'PubSubHubbub-Export'.

Change-Id: Ie6199a3cee33d91a5262f5e7bcf863b8c4e8bee2
Merge "Inserted a  time span which may be an change in the past in order to be published. Inserted tests for the special page 'PubSubHubbub-Export'."