Ahodges/doc/doc1119

@shnayder @WatsonEmily @dsjen @srpearce @stroilova here's the initial draft for the gender demographic data. I don't have access to real data yet, so can't quite finish up the screen-shot-and-its-interpretation piece. (Suggestions on a good illustration welcome)
The main reason to download is that the csv gives data over time.  So e.g. in the analytics in action story, the team might want to see what happened after they made efforts to recruit more women.