MedicationRequest not listed in patient targets

[hansenms]

MedicationRequest is not listed in patient middleware targets, so a search like:

smart.patient.api.fetchAllWithReferences(
                { type: "MedicationRequest" },
                [ "MedicationRequest.medicationReference" ])

Will not be patient specific. This causes the medications sample app https://github.com/smart-on-fhir/sample-apps-stu3/blob/master/medications/index.html to be not patient specific.