TEMPORARILY disabled several specs depending on selection/range.

Pending new selection code. `endpoint_spec`, for example, is completely disabled.
Reorganised (most) CSAT-specific source files.

Most all CSAT-specific classes moved to `csat` dir. Only files remaining in top-level `app/assets/javascripts` directory are `application.js`, `selection_wrapper.js.coffee` and `welcome.js.coffee`.