Merge branch '644-missing-header' into 'master'

Remove loading callbacks from fragment listener

Now fragments are responsible for their own Progress bars.

Closes #642

See merge request !316

briar-android/src/org/briarproject/android/sharing/ShareActivity.java

@@ -89,16 +89,6 @@ public abstract class ShareActivity extends BriarActivity implements
 		return contacts;
 	}
 
-	@Override
-	public void showLoadingScreen(boolean isBlocking, int stringId) {
-		// this is handled by the recycler view in ContactSelectorFragment
-	}
-
-	@Override
-	public void hideLoadingScreen() {
-		// this is handled by the recycler view in ContactSelectorFragment
-	}
-
 	@Override
 	public void onFragmentCreated(String tag) {