Add title param to mwapi.get_recent_edits.
Show full changes to page instead of single rev.

Instead of just showing a diff between the newest and the second newest
revision, show all the recent changes made in a row by the same user in
the diff. My once so beautifully structured program has become somewhat
of a mess. However, I'm too lazy to refactor it right now, so I suppose
the mess stays for a while.

Basically what I've done is added a get_diff_ids method to MWCaller,
added another parameter (of type str) to the next_rc_result signal. And
of course there's a lot of checks and stuff like that. I hope I haven't
overlooked something.
Changed a log level in MWCaller.