[Refactoring] Extract ACL config to separate xml
Use role hierarchy also on web/http security level
Add getter/setter for autowired AclService

This is needed to set this property in a testing context.
Add spring-test dependency
Add resources needed for the AclUtil test.
Actually add the AclUtilTest
Merge pull request #40 from buehner/add-tests

Add AclUtil tests
Merge pull request #38 from buehner/role-hierarchy

Enable role hierarchy on web/http security level