Upgrade Springfox swagger to 2.4.0 from 2.3.1
Upgrade Springfox swagger to 2.4.0 from 2.3.1

The upgrade fixes the parseInt exception that was appearing in logs.

laurianed/catalog,paraita/workflow-catalog,ow2-proactive/catalog,yinan-liu/workflow-catalog,ow2-proactive/catalog,laurianed/catalog,ShatalovYaroslav/catalog,ShatalovYaroslav/catalog,laurianed/catalog,ow2-proactive/catalog,laurianed/workflow-catalog,gparanthoen/workflow-catalog,ShatalovYaroslav/catalog,ow2-proactive/workflow-catalog