anchor.diff:    };
   
     function s3Object(uri){
  -    if (url.hostname === 's3.amazonaws.com'){
  +    if (uri.hostname === 's3.amazonaws.com'){
         return '/' + uri.pathname.split('/').slice(2).join('/');
       } else {
         return uri.pathname;
  
positive.code:   function generateEndpoint(source, modifiers){
      var uri, cdn, mods, path;
  
      uri = source || URI(source);
      cdn = IR.CDN.replace(/\/$/, '');
      mods = modStr(uri, modifiers);
      path = buildPath(uri, modifiers);
  
  
negative.code:     var parser = document.createElement('a');
      parser.href = url;
      return parser;
    };
  
    function fbUid(uri){
      return uri.pathname.split('/')[1];
    };
  
    function IR(){}
  
    IR.irImageTag = function(){
      var args = parseArgs.apply(this, arguments),
          url = generateEndpoint(args.source, args.modifiers);
  
      return '<img src="' + url + '" />';
    };
  
    IR.irBackground = function(){
      var args = parseArgs.apply(this, arguments),
          url = generateEndpoint(args.source, args.modifiers);
      return 'background-image:url(' + url + ')';
    };
  
  