Manually merged PR, Closing android-async-http#759

Author: smarek

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

@@ -1190,6 +1190,18 @@ public RequestHandle delete(Context context, String url, Header[] headers, Respo
         return sendRequest(httpClient, httpContext, delete, null, responseHandler, context);
     }
 
+    /**
+     * Perform a HTTP DELETE request.
+     *
+     * @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.
+     */
+    public void delete(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
+        final HttpDelete delete = new HttpDelete(getUrlWithQueryString(isUrlEncodingEnabled, url, params));
+        sendRequest(httpClient, httpContext, delete, null, responseHandler, null);
+    }
+
     /**
      * Perform a HTTP DELETE request.
      *