Provider discovery needs to include a dynreg endpoint URI

[jmandel]

e.g. add a oauth2.registration_uri field:

{
  "name": "Good Health Clinic",
  "description": "Serving your health needs since 1999",
  "url": "http://goodhealthclinic.org",
  "patient_signin": "http://portal.goodhealthclinic.org",
  "location": {
    "geo": {                       
      "latitude": 42.3591,            # just making the point that we can
      "longitude": -71.0934           # use arbitrary schema.org properties
    }
  },
  "oauth2": {
    "registration_uri": "http://portal.goodhealthclinic.org/authorize",
    "authorize_uri": "http://portal.goodhealthclinic.org/authorize",
    "token_uri": "http://portal.goodhealthclinic.org/token"
  },
  "bb_api":{
    "summary": "http://api.goodhealthclinic.org/patient/documents/summary",
    "search": "http://api.goodhealthclinic.org/patient/documents/search"
  }
}