add export/import backup feature, squash some big bugs

v1.1.0 (2017-02-19)

• add backup export/import feature, you can now backup to services like google
  drive, email, local storage and so on. you won't have to do this unless you're
  on Lollipop, in which case please backup manually or a device reset will lose
  your data. Other versions (Android M, N), are perfectly fine and automatically
  backup, so you don't have to worry about this.
• bugs fixed related to changes not showing up without exiting the app and
  reentering. now you don't have to do that, so that's nice.
• clear all now works properly. before this, it did nothing -- we realized that
  wasn't too useful.
• there's now a settings page (accessible via 3 dot drop-down), there's also the
  'about' section, which you could use to find other ways to contact us. you know,
  if you felt like contacting me for some odd reason...