code: function(data, param) {
                var eol = getEol(data,param);
                var lines = data.split(eol);
                var partial = lines.pop();
                return {lines: lines, partial: partial};
              }
docs: convert data chunk to file lines array
  @param  {string} data  data chunk as utf8 string
  @param  {object} param Converter param object
  @return {Object}   {lines:[line1,line2...],partial:String}