Android Images: deprecate classes that won't be used in 3.1

jme3-android/src/main/java/com/jme3/asset/AndroidImageInfo.java

@@ -20,6 +20,7 @@ import java.util.logging.Logger;
   *
   * @author Kirill Vainer
   */
+@Deprecated
 public class AndroidImageInfo extends ImageRaster {
     
     private static final Logger logger = Logger.getLogger(AndroidImageInfo.class.getName());

jme3-android/src/main/java/com/jme3/texture/plugins/AndroidBufferImageLoader.java

@@ -50,6 +50,7 @@ import java.nio.ByteBuffer;
  * 
  * @author Kirill Vainer
  */
+@Deprecated
 public class AndroidBufferImageLoader implements AssetLoader {
     
     private final byte[] tempData = new byte[16 * 1024];

jme3-android/src/main/java/com/jme3/texture/plugins/AndroidImageLoader.java

@@ -8,6 +8,7 @@ import com.jme3.texture.Image;
 import com.jme3.texture.image.ColorSpace;
 import java.io.IOException;
 
+@Deprecated
 public class AndroidImageLoader implements AssetLoader {
 
     public Object load(AssetInfo info) throws IOException {