code: function setHelperOptions(context, key) {
      var optsHelper = context.options.helper || {};
      if (optsHelper.hasOwnProperty(key)) {
        context.helper.options = optsHelper[key];
      }
    }
docs: Update context in a helper so that `this.helper.options` is
  the options for that specific helper.
  
  @param {Object} `context`
  @param {String} `key`
  @api public