WIP: Rewrite as RubyMotion app

Todo:

 - [ ] Figure out a proper naming convention. Ruby generally uses `lower_snake_case`, while Objective-C generally uses `lowerCamelCase`.
 - [ ] Remove code from when I was trying things out.
 - [ ] Get feature parity with the current app (ie. add notifications)
 - [ ] More tests. Test all the things!