Use symfony/console 2.2

In the 2.2 version, we can ask with hidden response in the console
Use the version 2.2.0-RC3
Merge pull request #14 from laupiFrpar/console-2.2

Use symfony/console 2.2
Merge branch 'master' of git://github.com/digitas/digex-core into console-2.2

Conflicts:
	composer.json