code: function normalizeLinks(base, input) {
    if (!input) return;
    if (!Array.isArray(input)) input = [ input ];
  
    return flatten(input).filter(Boolean).map(function (link) {
      return normalizeLink(base, link);
    });
  }
docs: Takes the `input` links value and normalizes it into a single array.
  
  @param {String} base   The base URL for this API.
  @param {Object} input  The links value to normalize.
  @return {Array}