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.
Actually we already have the serializer [here](https://github.com/BuddyPlatform/Buddy-Android-SDK/blob/master/library/src/main/java/com/buddy/sdk/BuddyLocationDeserializer.java), so maybe we're missing the serializer?