now get_item is aware of rejected items
minor update of research view
Removed many bugs.
Simplified the menus.  Clearer feedback now.
Merge remote-tracking branch 'github/luca' into mshavlov
migration script to key value store
fix in migration script, task.feedback was task.why_bogus
small fix
CrowdRanker -> CrowdGrader
TP: major cleanup, venue -> assignment.
TP minor fix
TP: some other fixes.

Conflicts:

	controllers/submission.py
TP: better log levels for keystore.
Added a function useful for diagnosis
TP: the date of a submission is now updated when the submission itself is updated.
TP: better date format.
TP: Some small UI changes.
TP: removed run reputation system research, as it is not used.

Conflicts:

	controllers/rating.py
TP: Reads the comments from the key-value store before populating review form.
TP: better view of submissions to review.