correctly export .Stream

Author: calvinmetcalf

readable.js

@@ -1,9 +1,10 @@
-(function (){
+var Stream = (function (){
   try {
-    exports.Stream = require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
+    return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
   } catch(_){}
 }());
 exports = module.exports = require('./lib/_stream_readable.js');
+exports.Stream = Stream || module;
 exports.Readable = exports;
 exports.Writable = require('./lib/_stream_writable.js');
 exports.Duplex = require('./lib/_stream_duplex.js');