Ionic

(Don't merge this, I'll merge when done). 

This is current progress on the conversion to [Ionic](ionicframework.com) (follow conversation leading to this decision [here](https://trello.com/c/bzwFJdUd/89-ionic)). I'm about 90% done now, follow my chicken-scratch progress notes [here](https://workflowy.com/shared/ac3dc0a4-54d5-c8a6-4f12-f94cbb832cab/). APK build [here](http://s3.amazonaws.com/lefnirePublicFiles/HelloCordova-release%20(1).apk), for testing.