Make getUrlWithQueryString public

Author: jlopez

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

@@ -569,7 +569,7 @@ private void sendRequest(DefaultHttpClient client, HttpContext httpContext, Http
         }
     }
 
-    private String getUrlWithQueryString(String url, RequestParams params) {
+    public static String getUrlWithQueryString(String url, RequestParams params) {
         if(params != null) {
             String paramString = params.getParamString();
             url += "?" + paramString;