changed config file format to xml
added UserRepositoryFactory
added subquery for getting the system in roles
initialize only with security system, if security system is available
fixed missing dependency bug
Merge branch 'feature/login-system' of git://github.com/sulu-cmf/SuluSecurityBundle into feature/login-system
fixed UserRepositoryFactory
fixed roles formular
Merge branch 'develop' of git://github.com/sulu-cmf/SuluSecurityBundle into feature/login-system

Conflicts:
	Resources/public/dist/components/roles/components/form/main.js
extracted system as configuration parameter
adjusted tests due to latest changes
cleaned code
Merge pull request #54 from sulu-cmf/feature/login-system

added system check to login