added security contexts to SuluMediaAdmin
implemented SecurityContext as class because of symfony conventions
added sulu specific security checker
added compiler pass for adding the SecurityChecker, if security is enabled
implemented listener for Sulu specific security
added SecuredControllerInterface for defining requried security context in each controller
added locale to SuluSecurityListener
fixed controllers with new getLocale function
removed unused privleges
added security checks to node controller
fixed rebasing conflicts
added entry to changelog
cleaned code
fixed type in changelog
implemented SecuredControllerInterface for MediaController
secured controllers for users, roles and groups
adjusted user command to create a god user
updated changelog
corrected renaming of method
fixed globe icon