code: function (fp) {
      if (this.content) return this;
      fp = path.resolve(this.cwd, fp || this.path);
      this.content = utils.tryRead(fp);
      return this;
    }
docs: Read a utf8 string from the file system, or return if
  `content` is already a string.
  
  @name .read
  @param  {String} `fp` Filepath
  @api public