This commit introduces the patient check in ui elements and controller. It
also demonstrates the basic pattern for using a named nest ui-view within
a template. This can be contrasted with units as components.

This commit introduces the server structure for patient check ins,
allowing a request for all patient visits. It also introduces the initial
files and methods for testing the API.

This commmit introduces the end point to write to the patient_visit table
along with integration tests.

* Introduced client side check in service as a child of the
  `PatientService`
* ?limit querystring for /patients/:uuid/visits to limit the number of
  responses

This commit adds business logic that determines if the patient has
recently bene checked in and ensures the view displays the correct
warnings.

* End to end tests for checkin functionality
* Complete check in request client side
* Update view with latest check ins
* Reduce space between list elements on patient overview
* Remove references to previous patient visit implementations