Dev

@sefk @jinpa This, coupled with the fix/vik/oe-issues branch of edx-platform, allows for control options to be passed from the LMS to the ORA.  Right now, these control options are: minimum to calibrate, maximum to calibrate, required number of peer grading, number of peer grading per submission.

These control parameters will be able to be set in Studio, and will be read as needed here.  I have done some minimal testing with the CMS, LMS, and ORA, and it appears to work. I will do some more testing/write some unit tests this week.  If you would like to test, or have any time, a review would be nice.