code: function applyRules(_string, _ruleSet, _skip) {
  
        if(_skip.indexOf(_string.toLowerCase()) === -1) {
          var i = 0, rule;
          while(rule = _ruleSet[i++]) {
            if(_string.match(rule[0])) {
              return _string.replace(rule[0], rule[1]);
            }
          }
        }
  
        return _string;
      }
docs: helper function used by singularize and pluralize