Analytics: Interface for slicing user analytics

[jamestompkin]

Interface for analyzing user clicks / progress

• By week / month, etc.
• By course, by concept, etc.
• Per segment
• Reports for students
• Reports for teachers

Using Google Analytics is one potential interface for this. Another is HarvardX systems.

[michaschwab]

The "report for students" sounds like an Achievements page, which I think sounds great. I moved that over to #187.