Define self and window global objects in the combined JS code so that:

* components making use of `window` can actually do it without the trick found in the `components.js` file of the dummy test app
* components/files packaged as CommonJS modules by browserify (using browserify-rails for instance) can successfully use `global`

 For this second point, this fix is necessary because of the self-calling function browserify uses to wrap code that uses the `global` variable:

 ```ruby
 (function (global){
     global.MyComponent = React.createClass({ ... });
 }).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
 ```
If `window` was used instead of `global`, it would still need the fix or the workaround found in the tests' dummy app as mentioned.

Author: olance

lib/react/renderer.rb

@@ -22,7 +22,7 @@ def self.render(component, args={})
 
     def self.setup_combined_js
       <<-CODE
-        var global = global || this;
+        var global = global || this, self = self || this, window = window || this;
 
         var console = global.console || {};
         ['error', 'log', 'info', 'warn'].forEach(function (fn) {