Turn template into HTML, minus the wrapper element.
function() {
    var template = this.getTemplate(),
        data;

    this._preRender();
    data = this.getTemplateData();
    data = this.decorateTemplateData(data);
    if (template == null) {
      throw new Error(this.name + ": template \"" + this.getTemplateName() + "\" not found.");
    }
    return template(data);
  }