v0.7.5b: adjusted text rendering to always occur on the render thread

SPD-classes/src/main/java/com/watabou/noosa/Game.java

@@ -32,6 +32,7 @@ import com.watabou.input.InputHandler;
 import com.watabou.input.KeyEvent;
 import com.watabou.noosa.audio.Music;
 import com.watabou.noosa.audio.Sample;
+import com.watabou.utils.Callback;
 import com.watabou.utils.PlatformSupport;
 import com.watabou.utils.Reflection;
 
@@ -245,6 +246,15 @@ public class Game implements ApplicationListener {
 		Gdx.app.error("GAME", sw.toString());
 	}
 	
+	public static void runOnRenderThread(Callback c){
+		Gdx.app.postRunnable(new Runnable() {
+			@Override
+			public void run() {
+				c.call();
+			}
+		});
+	}
+	
 	public static void vibrate( int milliseconds ) {
 		Gdx.input.vibrate(milliseconds);
 	}