Merge pull request AsyncHttpClient#520 from twu8/master

use passed in config instead of default config. This is to fix config in...

Author: jfarcand

api/src/main/java/org/asynchttpclient/DefaultAsyncHttpClient.java

@@ -105,7 +105,7 @@ public DefaultAsyncHttpClient(AsyncHttpClientConfig config) {
      * @param providerClass a {@link AsyncHttpProvider}
      */
     public DefaultAsyncHttpClient(String providerClass, AsyncHttpClientConfig config) {
-        this(loadProvider(providerClass, config), new AsyncHttpClientConfig.Builder().build());
+        this(loadProvider(providerClass, config), config);
     }
 
     /**