I just want to notify, that the nose tests are going to fail now as test wikipedia now emits a warning when a action=query is executed without a continue parameter.[1]
I've uploaded a temporary fix which avoid breaking the tests[2] but this should replaced with a better solution soon.
Unfortunately I don't know how we solve this the best. The main problem is that we don't know what we need to do because for that we need to know which version the server is using. My idea would be to add an empty 'continue' if there is no 'continue' or 'rawcontinue' present (could be done in Request._add_defaults). Of course we also need to update QueryGenerator to set 'rawcontinue' at first until we update it to use the new system.
I'll try to upload a intermediary fix for which I invite others to add comments (if applicable of course) and improve it.
1: https://lists.wikimedia.org/pipermail/mediawiki-api-announce/2014-September/... 2: https://gerrit.wikimedia.org/r/168523