Ahodges/doc/doc1118

@shnayder @marcotuts @mulby @stroilova @JAAkana @WatsonEmily 
Educational level demographics!
More of a product question for @shnayder , but: Will we eventually include the date that the student enrolled as well as their education level? Someone in high school in 2012 might have a different level of education in 2018, and if I read this correctly we aren't reporting on the freshness of the information shared.