Switch peer_api.get_submission_to_assess to use sub API instead of model.
Add caching for rubric option selection.
Bypass REST framework serializer validation for assessment part creation (we validate before anyway).
Rework Assessment serialization to take advantage of caching.
Make memcached the default local cache in dev.
Minor comments and simplification of Assessment serialization.
Cache serializations of Assessments themselves.
Lower the number of SQL operations to fetch the latest score for
a submission from 3 to 1.
Cache median scores from assessments
Remove minor redundant queries for checking number of peer assessments associated with a peer workflow.
Add python-memcached to dev requirements.
Make it so that create_assessment returns the same (cached) data structures that get_assessment(s) returns.
Add comments, fix typo.
Small refactoring and adding comments in response to PR comments.
Merge pull request #182 from edx/ormsbee/kill_queries

Reducing query count