Merge pull request android-async-http#180 from chengc03/master

Use obtain instead of new on Message creation to improve memory efficiency.

Author: loopj

src/com/loopj/android/http/AsyncHttpResponseHandler.java

@@ -209,7 +209,7 @@ protected Message obtainMessage(int responseMessage, Object response) {
         if(handler != null){
             msg = this.handler.obtainMessage(responseMessage, response);
         }else{
-            msg = new Message();
+            msg = Message.obtain();
             msg.what = responseMessage;
             msg.obj = response;
         }