Dashboard: Grading curve widget

[pdpinch]

As a learner, I want to see how I rank compared to other micromasters students.

We have been told my the SCM team that this is a frequent question, particularly from learners interested in applying for the blend masters. They are all too aware that there are thousand of SCM MIcroMasters students but only a few dozen openings in the master program.

The challenge is how best to represent the learner's standing at any given moment, and to which other students they should be compared. A learner may have some final grades and even more than one current "in progress" grade. Other learners may have finished more or fewer courses.

Here is the current design (from MM2 on invision):