message: Add get_greeting
diff: @@ -432,6 +432,9 @@ function Facebookbot(configuration) {
  delete_greeting: function () {
  facebook_botkit.api.messenger_profile.deleteAPI('greeting');
  },
  + get_greeting: function () {
  + facebook_botkit.api.messenger_profile.getAPI('greeting');
  + },
  get_started: function (payload) {
  var message = {
  'get_started': {
  