Features, repositories and dependencies updated to use Spring Security
3.0.8-RELEASE and Spring 3.0.7-RELEASE and their dependencies.

Bug solved in ResourceManager.getResourceDescriptor(String resourceId).
Now it returns the descriptor when the Resource is present in any
repository.

OpenNaaS Core Security bundle with complete Spring Context with desired
security configuration. New ACLManager that creates ACL DB, fills it
with basic users and allows creating ACLs and ACEs. It is exported as an
OSGi service.

Removed unnecessary tables in security DB. Only ACL tables remain.

New Security iTest.