code: function (lines, params, idx) {
                if (params._needParseJson) {
                  if (!params._headers) {
                    params._headers = [];
                  }
                  if (!params.parseRules) {
                    var row = params._headers;
                    params.parseRules = parserMgr.initParsers(row, params);
                  }
                  return processRows(lines, params, idx);
                } else {
                  return justReturnRows(lines, params, idx);
                }
              }
docs: Convert lines of csv array into json
  @param  {[type]} lines  [[col1,col2,col3]]
  @param  {[type]} params Converter params with _headers field populated
  @param  {[type]} idx start pos of the lines
  @return {[type]}   [{err:null,json:obj,index:line,row:[csv row]}]