Law School - Adding API attribute isLawStudent

Added attribute isLawStudent to /my/status API, removed previous isLawStudent method from academicsController.
This changes makes our User API depend on Bearfacts, which is a slow external source that starts emitting 403s when traffic goes above a very moderate level. That's going to produce problems for us. It's particularly bad since our entire UI depends on our User API. 

I think we should find another place to put the isLawStudent data. 

What is motivating this change? Is the flag needed beyond just the academics page?