WIP: Verify requirements page

* WIP implementation of the "verify requirements" page.
* The views return JSON objects with template context; the templates aren't actually rendered yet.
* The tests verify the template context, but this is encapsulated in helper methods.  Once I add template rendering, it should be easy to rewrite those methods to verify the actual content of the page.

@dianakhuang When you get a chance, could you take a look at this?  Looking for feedback on the URL structure and view logic, in particular if I'm missing any states we're going to need.
Why is this duplicated this way? It seems odd.