close mp3 file handles.

src/org/newdawn/slick/openal/OpenALStreamPlayer.java

@@ -392,5 +392,16 @@ public class OpenALStreamPlayer {
 	public void resuming() {
 		lastUpdateTime = System.currentTimeMillis() - offsetTime;
 	}
+
+	public void close() {
+		if(audio != null){
+			try {
+				audio.close();
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+		
+	}
 }