Move logins used for development to a common area.

Also describe the purpose of the devel subdirectory.
An Ops mock.
Add ncs_navigator_authority for searching Ops.

We'll switch back to a release version when
https://github.com/NUBIC/ncs_navigator_authority/pull/6 (or something
like it) is merged in.
Re-lock gem environment.
Wire Ops' URL into Pancakes.

Also add a startup check for presence of required service URLs.
Scenarios for GET /api/v1/data_collectors.
Implement GET /api/v1/data_collectors.

We might need a DataCollector model at some point, but not right now.