ZF2-244: Update JsonStrategy so that it kicks in based on a URL parameter

Description

It would be helpful if the JsonStrategy kicked in if the URL is http://example.com/foo/bar.json or http://example.com/foo/bar?format=json

(Idea based on feedback from Lukas Smith)

Comments

This issue has been closed on Jira and moved to GitHub for issue tracking. To continue following the resolution of this issues, please visit: https://github.com/zendframework/zf2/issues/2469