code: function loadKeyValueCSV (filename, callback) {
    var out = {}
  
    csv()
    .from.path(filename, {
      delimiter: '\t'
    })
    .on('record', function (data, index) {
      if (data[0].match(/^[\w\d]/)) {
        out[data[0]] = data[1]
      }
    })
    .on('end', function (count) {
      callback(null, out)
    })
    .on('error', function (err) {
      callback(err)
    })
  }
docs: Loads key-value-pairs saved in a CSV file into
  an object.
  
  @param {String} filename to read from
  @param {Function} callback that takes the object