code: function loadSettings(source, ctx) {
    return loadSingle(source).then(function (data) {
      if (data) {
        data = JSON.parse(data);
        ctx.override = data.override;
      }
    });
  }
docs: Loads a settings file and sets appropriate options. Used to determine
  whether or not we should completely override a style in a theme
  
  @param {string} source The source of the settings file to load
  @param {Object} ctx The given context to set our options
  @return {Promise}