Merge pull request #5 from mikeseghers/master

Server validation improvement
use Encoder for converting TicTacToeMessage to text
Android client
Merge pull request #6 from filipmaelbrancke/master

Android client
Update README.md
Merge branch 'master' of github.com:Adopt-a-JSR/JSR-356
Made android compliant with new server protocol
- also added extra win step on server
- also improved model on iOS version
- also added "win" detection on iOS version