Initial work on both table-based progress dashboard, as well as a new div-based one with animation.
Merge branch 'finished' into prog
Work on student progress.  Now shows actual progress from student data, includes single-level stages, and correct per-stage level number.
Merge branch 'finished' into prog
New student progress now uses random values, just for show, done by flipping a switch.  Easy to flip back.
Revert background-color change for existing student progress.
Merge pull request #791 from code-dot-org/prog

Initial work on new student progress for teachers