CodeIgniter routing with AppEngine

A few more steps forward on my Deduper project. I designed out the URL's and got the rudimentary homepage and create set form going. Also got it integrated with my local MySQL install. The one thing I learned lately is that with CodeIgniter in Google AppEngine, you have to configure the index_page (in config/config.php) to be blank so index.php doesn't get injected into the various URL's it creates. My app.yaml directs all requests already to index.php, so the extra index.php confuses CodeIgniter's routing.