WIP - appium tests

Been playing with Appium at work, so now this is the closest I've been able to get to actually testing PouchDB with Appium.

Basically just connect an Android device (emulator is too slow) and run

```
DEVICE=true COUCH_HOST=http://myhost:2020 npm run test-cordova
```

and it'll install all the Appium crap and run like 12 servers at once and run a stupid test that loops for 10 minutes and is really brittle but hey, it's getting there. :)