parseFrontMatter() {
    var yaml = this.content.split(this.config.frontMatterSeperator)[1];
    if (yaml) {
      var attributes = {};
      yaml.split(/\n/g).forEach((attributeStr) => {
        var attribute = attributeStr.split(':');
        attribute[1] && (attributes[attribute[0].trim()] = attribute[1].trim());
      });
      extend(this, attributes, null);
    }
  }
Parse front matter.
@method
@description
Overrides post attributes if front matter is available.