Bug resolved: creation of ACL SQL tables into security DB, not
previously created. Added zero user rows (with some errors by now).
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.
Users loaded from a properties file located in the OpenNaaS Core
Security bundle.
ACLManager registered as OSGi service in Java code to access ConfigAdmin
OSGi service and extract WS URL property.

Users and roles hardcoded in Spring Security context.

ACLManager WS interface only with GET HTTP Requests and path params.
Merge pull request #605 from logoff/feature/security

Feature/security

New OpenNaaS Core Security bundle created that exports an OSGi service that can be used to secure OpenNaaS Resources and ask for accessibility to them. It is based on Spring Security ACLs engine.

Besides, new integration test created to check correct work of previous bundle.