Remove Location from list of SMART launch parameters

Fixes smart-on-fhir#131

Note that I removed documentation of both the launch param and the
launch/location scope. The spec already enables launch scopes and
corresponding launch params to be extended if required.

scopes-and-launch-context/index.md

@@ -140,7 +140,6 @@ Requested Scope | Meaning
 ------|----------------------------
 `launch/patient` | Need patient context at launch time (FHIR Patient resource)
 `launch/encounter` | Need encounter context at launch time (FHIR Encounter resource)
-`launch/location` | Need location context at launch time (FHIR Location resource)
 (Others)| This list can be extended by any SMART EHR if additional context is required.
 
 ### Launch context arrives with your `access_token`
@@ -166,7 +165,6 @@ Launch context parameter | Example value | Meaning
 ------|---------|-------------------
 `patient` | `"123"`| String value with a patient id, indicating that the app was launched in the context of FHIR Patient 123. If the app has any patient-level scopes, they will be scoped to Patient 123.
 `encounter` | `"123"`| String value with an encounter id, indicating that the app was launched in the context of FHIR Encounter 123.
-`location` | `"123"`| String value with a location id, indicating that the app app was launched from the phyical place corresponding to FHIR Location 123.
 `need_patient_banner` | `true` or `false` (boolean) | Boolean value indicating whether the app was launched in a UX context where a patient banner is required (when `true`) or not required (when `false`). An app receiving a value of `false` should not take up screen real estate displaying a patient banner.
 `resource` | `"MedicationPrescription/123"`| String value with a relative resource link, describing some specific resource context for the (in this case, a particular medication prescription). This is a generic mechanism to communicate to an app that a particular resource is "of interest" at launch time.
 `intent` | `"reconcile-medications"`| String value describing the intent of the application launch (see notes [below](#launch-intent))