[CHORE] Add spec for controllers/app.js

Refactor controller setup into beforeEach block
Assert that all public behavior of the app controller are functions
[CHORE] Remove redundant and unspecific controllersSpec

Tests for AppCtrl are now in test/unit/controllers/appControllerSpec.js
Example test has been moved into its own file,  test/unit/exampleSpec.js
[CHORE] Add empty spec file to test controllers/status.js

[BUG] Add blank line at end of file