Emit 'page-title-updated' as javascript event for window.

browser/api/lib/window.coffee

@@ -1,5 +1,11 @@
+EventEmitter = require('events').EventEmitter
+
 Window = process.atom_binding('window').Window
 
+# Inherits EventEmitter.
+for prop, func of EventEmitter.prototype
+  Window.prototype[prop] = func
+
 # Convient accessors.
 setupGetterAndSetter = (constructor, name, getter, setter) ->
   constructor.prototype.__defineGetter__ name, ->