Replace config/secrets.yml, it contains no secrets
Use references
Merge pull request #35 from CruGlobal/add_back_secrets_yml

Replace config/secrets.yml, it contains no secrets
Some update tests for EntityTypesController
Another update test for EntityTypesController
One more root system update test
Get test for EntityTypesController 'editable' attribute

Also, clean up other unrelated comments
Two more *TypesController tests

Also, filter out deliberately broken tests during development
Only test response.body for virtual attributes...

...like 'is_editable'. Test assigns() objects for others.
More new MeasurementTypesController tests, and...

...minor tweaks to existing ones
Factor common code from EntityTypesController tests

...and tweak let!() to let() in MeasurementTypesController tests
One more MeasurementTypesController test

Also, factor common code
All relevant RelationshipTypesController tests
created_by || root? check for EntityTypesController#update

...unbreaks two tests. Also, rename render_* numeric methods