Bug issue #1943 - First check if parameter $param['Action'] is setted, in file mailjet-api-v3.php

Bug issue #1943 - First check if parameter $param['Action'] is setted,
in file mailjet-api-v3.php
Modification of how to detect v1 and v3 users

Modification of how to detect v1 and v3 users
Merge pull request #7 from mailjet/development

Merge the development and master branches