Merge pull request reactjs#6 from jchapple/dev-global-scope-fix

Fix to ensure that global, self, and window are all pre-defined

Author: zpao

ReactJS.php

@@ -58,7 +58,7 @@ function __construct($libsrc, $appsrc) {
     $react = array();
     // stubs, react
     $react[] = "var console = {warn: function(){}, error: print}";
-    $react[] = "var global = {}";
+    $react[] = "var global = global || this, self = self || this, window = window || this";
     $react[] = $libsrc;
     $react[] = "var React = global.React";
     // app's components