code: function(options) {
          options = options || {};
  
          var params = [
              'color=' + (options.color || '000000').replace(/^#/, ''),
              'width=' + toInt(options.width || 1),
              'height=' + toInt(options.height || 1),
              'mode=' + (options.mode || 'outbound')
          ];
  
          return this.append('border:' + params.join(','));
      }
docs: Add a border to the image
  
  @param  {Object} [options={}]
  @param  {String} [options.color=000000]  Color of the border (in hex-format)
  @param  {Number} [options.width=1]       Width of the left and right borders
  @param  {Number} [options.height=1]      Height of the top and bottom borders
  @param  {String} [options.mode=outbound] Mode of the border, "inline" or "outbound"
  @return {Imbo.ImageUrl}