CLC-3410 First batch of proxy reorg

https://jira.ets.berkeley.edu/jira/browse/CLC-3410

Covering Bearfacts and the 2 proxies that fetch content from ETS blog. 

The sharp-eyed reviewer will note some duplication in filenames between app/models/bearfacts and app/models/my_academics classes. e.g. exams.rb appears in both Bearfacts:: and MyAcademics:: modules, each doing part of the business logic work. My plan (for later) is to collapse these where appropriate. Not every merged model will collapse in this way.