code: function(callback) {
              fs.exists(file, function(exists) {
                  if(!exists) {
                      rawData = file;
                      if(typeof rawData === "string") rawData = new Buffer(file);
                      return callback();
                  }
  
                  fs.readFile(file, function(err, data) {
                      if(err) return callback(err);
                      rawData = data;
                      return callback();
                  });
              });
          }
docs: get the raw data
  @param callback