code: function generateSlug (title) {
      if (typeof title !== 'string') {
          throw new MeowError ('title is not a string');
      }
      title = title || '';
      title = title.toLocaleLowerCase().replace(/[\W]/g, '-').replace(/[\-]{2,}/g, '-');
      return title;
  }
docs: Generates slug for a given title
  @param title
  @returns {string} slug generated for @param title