[DDC-3205] #1120 - metadata info command

Supersedes #1120 - see DDC-3205 (http://www.doctrine-project.org/jira/browse/DDC-3205)

![preview](http://marco-pivetta.com/screen/caps/9a3a9f.png)
As per discussion with @stof ( https://twitter.com/Stof70/status/524229052434231296 ) this is NOT ok, and therefore I'll have to find a workaround that doesn't imply using `symfony/console:~2.5`