Users can chose if they display their email or not.
Merge branch 'master' of github.com:claroline/CoreBundle into display-email

Conflicts:
	Library/Installation/AdditionalInstaller.php
	Resources/translations/platform.en.yml
	Resources/translations/platform.fr.yml
Fixing updater.
set default email visibility to false
Merge pull request #466 from ngodfraind/display-email

Users can chose if they display their email or not.