[feature] Move LDAP methods from LdapProvider class to new Ldap/Connection class
[feature] Add LdapImportCommand to import ldap users directly to database
[fix] Implement checking of required user fields
[fix] Refactor LdapProvider due to new Ldap Connection class
[fix] If password of ldap user changes, database authenticates with old password. fixed.
[feature] Added command to package
[feature] Added quickstart sample authentication class
[feature] Added quickstart sample login view