Merge pull request android-async-http#967 from cherez/patch-1

Made delete(url, params, handler return a RequestHandle.

Author: smarek

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

@@ -1413,10 +1413,11 @@ public RequestHandle delete(Context context, String url, Header[] headers, Respo
      * @param url             the URL to send the request to.
      * @param params          additional DELETE parameters or files to send with the request.
      * @param responseHandler the response handler instance that should handle the response.
+     * @return RequestHandle of future request process
      */
-    public void delete(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
+    public RequestHandle delete(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
         final HttpDelete delete = new HttpDelete(getUrlWithQueryString(isUrlEncodingEnabled, url, params));
-        sendRequest(httpClient, httpContext, delete, null, responseHandler, null);
+        return sendRequest(httpClient, httpContext, delete, null, responseHandler, null);
     }
 
     /**