Merged in PhotonQyv/mastodon_etalab/VideoPlaybackLooping (pull request #90)

Video playback now loops for both video previously downloaded, & video downloaded for the first time.

app/src/main/java/fr/gouv/etalab/mastodon/activities/MediaActivity.java

@@ -362,6 +362,8 @@ public class MediaActivity extends AppCompatActivity  {
                                     @Override
                                     public void onPrepared(MediaPlayer mp) {
                                         loader.setVisibility(View.GONE);
+                                        mp.start();
+                                        mp.setLooping(true);
                                     }
                                 });
                                 videoView.setVisibility(View.VISIBLE);