Fix warnings
Move password-hasher to obiba-commons
Merge pull request #620 from obiba/hasher

Move password-hasher from Opal to Commons
RestRealm (uggly) integration
ObibaRealm integrated
Obiba realm configuration ignored if agate url is blank. Set session permissions when auth by ticket.
AuthenticationExecutor implementation added. Code cleanup
AbstractAuthenticationExecutor added.
Merge branch 'agate' of https://github.com/obiba/opal into agate