Android sample app

This is v1 of the sample app. It doesn't include push; including push would require many more steps on the end-users part and would eliminate the "works out of the box" sample we're going for.
Using a file picker to pick an image isn't as much of an issue as it is ensuring that the end user has images on their emulator. If we want an "out of the box" sample app we have to guarantee they have files to upload to their app. The app doesn't display them either way so I figured it didn't matter as long as they can see the server responses in the logs.