More admin pieces to see peer info.

apps/openassessment/peer/admin.py

 from django.contrib import admin
 
-from openassessment.peer.models import Assessment, AssessmentPart
+from openassessment.peer.models import Assessment, AssessmentPart, Rubric, Criterion, CriterionOption
 
 admin.site.register(Assessment)
 admin.site.register(AssessmentPart)
+admin.site.register(Rubric)
+admin.site.register(Criterion)
+admin.site.register(CriterionOption)
+

apps/openassessment/peer/models.py

@@ -159,6 +159,9 @@ class Assessment(models.Model):
     def submission_uuid(self):
         return self.submission.uuid
 
+    def __unicode__(self):
+        return u"Assessment {}".format(self.id)
+
 
 class AssessmentPart(models.Model):
     assessment = models.ForeignKey(Assessment, related_name='parts')