Include expanded schemas options to include refs

[Sleavely]

This fixes an issue where enum_titles from $refs aren't considered.

Before:

After:

Reproducing the issue on v0.7.28:

var default_value = {
  "name": "Event name",
  "starterSegment": {
    "id": 7,
    "name": "User has registered email"
  }
};
var config_schema = {
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "http://example.com/root.json",
  "definitions": {
    "segment": {
      "type": "object",
      "format": "select",
      "properties": {
        "id": { "type": "number", "minimum": 0 },
        "name": { "type": "string" }
      },
      "required": ["id", "name"],
      "enum": [{id: 1, name: "Hello kitty fans"},{id: 3, name: "User has not checked out recently"},{id: 7, name: "User has registered email"}],
      "options": {
        "enum_titles": ["Hello kitty fans", "User has not checked out recently", "User has registered email"]
      }
    }
  },
  "properties": {
    "name": {
      "default": "",
      "description": "An explanation about the purpose of this instance.",
      "id": "http://example.com/root.json/name",
      "propertyOrder": 50,
      "title": "The configuration's name. Only used for your benefit.",
      "type": "string"
    },
    "starterSegment": {
      "title": "Starter segment",
      "$ref": "#/definitions/segment",
      "propertyOrder": 350
    }
  },
  "required": ["name","starterSegment"],
  "type": "object"
};

// Initialize the editor
JSONEditor.defaults.theme = 'bootstrap3';
JSONEditor.defaults.iconlib = 'fontawesome4';
var editor = new JSONEditor(document.getElementById('jsoneditor-area'), {
  disable_edit_json: true,
  disable_properties: true,
  schema: config_schema,
  startval: default_value
});