Move the resource models/collections into js/resources/.

As part of an attempt at reorganization before moving to require.js,
I've moved all the resource models and collections into a js/resources/
directory.

There are no code changes, aside from changing the descriptive name of
each unit test suite to have "resources/" prefixed.

Unit tests pass.

Tested the dashboard, review request pages, screenshots, file attachments,
and the diff viewer.