CLC-3410 Sixth batch of proxy reorg: Research, Financials, Sakai

https://jira.ets.berkeley.edu/jira/browse/CLC-3410

Move Research, Financials, and Sakai from lib/proxies to app/models/. 

As Ray & I discussed on IM, the plan is also to move lib/campusdb/* into appropriate packages under app/models. Some of the classes will go in app/models/sakai, some will go into app/models/campus_oracle. I'll address that work in a separate pull.