Ahodges/documentation/doc158

@WatsonEmily please share with PMs who have worked through this process with data czars before... I'd love to get their feedback on level of detail and completeness.
@rocha and @stroilova , please let me know if this information is accurate (or designate others in Analytics).
@mhoeber and @srpearce , your feedback always welcome.

The first paragraph says that edX delivers data packages to the data czar, but this paragraph says the data czar downloads the data package. I think (correct me if I'm wrong) that edX transfers course data to a secure site at regular intervals, and then the data czar logs into that site to access and download the data package. If this is true, can we explain it more clearly?