code: function Overlay(options) {
    ui.Emitter.call(this);
    var self = this;
    options = options || {};
    this.closable = options.closable;
    this.el = $(html);
    this.el.appendTo('body');
    if (this.closable) {
      this.el.click(function(){
        self.hide();
      });
    }
  }
docs: Initialize a new `Overlay`.
  
  @param {Object} options
  @api public