Update README.md

added initial documentation
Update README.md

extended documentation
Update README.md

Added information on how to extend the persontype
Merge branch 'master' of github.com:Tactics/UserBundle

Conflicts:
	README.md
Added address validation/translation
Added TacticsUser validation group
ignores usernamen/password validation by fosuser
Merge branch 'validation' into develop

Conflicts:
	Resources/translations/validators.nl.yml
	Traits/Address.php
Removed cf-logo from seurity login template
Merge branch 'master' into develop
Merge branch 'remove_logo' into develop