Merge remote-tracking branch 'p2pu/master'
Added more badges to the fixture. Need to add images though.
Fixing typo.
Fixing http404 in self-assessment badges page.
Fixing typo.
Changing comments layout.
Changing threaded comments layout for challenge groups.
Add division between task and task disscusion and post-comment button at the end of the task.
Adding task navigation menu.
Changed out the collaborative graphic.
Adding missing css class.
Bug fix: always display task dissusion area if is challenge since the post comment button is there.
Tweak of button CSS for IE
Just get an empty list of rubrics instead of 404 for badge views
Adding I am done button to challenge tasks.
Merge branch 'master' of github.com:p2pu/lernanta
Adding more badge images and updating the fixture.

* TODO check which is the image for the webmaking 101 basic badge (maybe the image for the introduction course is the one with no slices).
Beginning of rubrics for the assessment view
Merge remote-tracking branch 'p2pu/master'
Added rated rubrics to view of assessment