Attached is a test version that should work for both the existing 1.X calibre and the upcoming 2.X version calibre. 2.x will use PyQt5 which requires changes to virtually all plugins.
This version needs to be tested with the existing calibre.
Brave souls to test with with the beta 2.X version would also be appreciated. Links to the 2.X beta and discussion of the transition (for plugins) can be see at:
Attn plugin developers: calibre moving to Qt 5.
As a bonus, I have also attached a metadata source plugin for the Kobo books shop. I have been testing this for a couple of weeks and would like some opinions on it. It doesn't do covers, but should do everything else.
Edit: The configuration dialog was broken in the Qt4 version of calibre. Fixed that plus gave this version of the plugin version number 1.201.0 to match the beta version of calibre.