Typo fix
WIP: Changed spring security  config to use authentification from a LDP server (see tgol-security.xml). Started implementing ACL using spring security provided implementation (see acl-context.xml).
This last point implied adding some functionality to the DAO classes and some dependencies to spring security.
Also started to break the usage of TgolUserDetails and the User entity (since it will be replaced by SpringSecurity Authentication and LdapUserDetails/InetOrgPersonDetails).
Moved test realised on Contract to more generic abstract classes and
interfaces.

ACLs are still only used on Contracts (through the @PostFilter
annotation on ContractDAO#findAllIndexes).