Fix unit tests

Fix PHPUnit tests that did not pass due to invalid SHA signature.
Fix bundle parameters (start with bundle alias)

As stated in the docs (@see
http://symfony.com/doc/master/cookbook/bundles/best_practices.html#configuration):
"Each parameter name should start with the bundle alias, though this is
just a best-practice suggestion."
Merge branch 'config_parameters'
Add support for Ogone DirectLink API

Add OgoneDirectLink service in order to execute queries (DirectLink
Query) and maintenance operations (DirectLink Maintenance) via Ogone
API:

  * new OgoneDirectLink service
  * new bundle parameters (snowcap_ogone.api.user_id, .password)
  * new dependency to handle POST request to Ogone API: Buzz
Add Ogone DirectLink console commands

New console commands:
  * ogone:directlink:query
  * ogone:directlink:renew
  * ogone:directlink:cancel
  * ogone:directlink:capture
  * ogone:directlink:refund