AndroidEnv: The Android Learning Environment

If I had a magic wand, I'd update the title to be "The Android Reinforcement Learning Environment" because as titled right now, it sounds like a way to learn Android. Maybe that's my fault for not recognizing the deepmind.com domain but still

Separately, I can't figure out why there are "phantom swipes" when the AI is playing 2048: https://lh3.googleusercontent.com/A2OTChR2rs-04cp8qfoFR2Iz6J... I thought at first maybe it was swiping in an invalid direction, but one can see it traces almost the same path next time and then it results in tile movement. I don't know what's actually going on there