prevent access to UPGRADING via .htaccess
Submit Addressbook advanced search form with Enter key (#1488568)
Merge pull request #55 from raoulbhatia/master

prevent access to UPGRADING via .htaccess
Use the right variable for IPv6 check
Use LDAP fallback hosts on connect + bind because with OpenLDAP 2.x ldap_connect() always succeeds but ldap_bind() will fail if host isn't reachable.
Add option for LDAP bind timeout (sets LDAP_OPT_NETWORK_TIMEOUT on PHP > 5.3.0)
Updated changelog