Merge pull request #1198 from gilesbradshaw/master

export PropTypes

Author: mjackson

modules/index.js

@@ -28,3 +28,6 @@ exports.createRoutesFromReactChildren = require('./createRoutesFromReactChildren
 exports.create = require('./createRouter');
 exports.run = require('./runRouter');
 
+//added by giles!
+exports.PropTypes = require('./PropTypes');
+