Updated AccountService API

AccountService is now stateless. That means every request needs its own authentication
request (bind).

Usage examples:

      * register a new user
        >> service = AccountService(LDAP_HOST, LDAP_BASE_DN,SERVICES)
        >> foo = Account('foo','foo@bar.de', password='bar')
        >> service.register(foo, LDAP_ADMIN_USER, LDAP_ADMIN_PASS)

      * authenticate a new user
        >> service = AccountService(LDAP_HOST, LDAP_BASE_DN,SERVICES)
        >> foo = service.auth('foo', 'bar')

      * updates an account
        >> foo.change_mail('a@b.de')
        >> foo.change_password('bar2')           # changes root password
        >> foo.change_password('bar2', 'gitlab') # changes password for gitlab
        >> service.update(foo)                   # save changes in ldap backend
        # save changes in ldap backend as admin user
        >> service.update(foo, LDAP_ADMIN_USER, LDAP_ADMIN_USER)

      * delete an account
        >> service = AccountService(LDAP_HOST, LDAP_BASE_DN,SERVICES)
        >> service.delete(Account)
        >> service.delete('foo')

      * find accounts
        >> service = AccountService(LDAP_HOST, LDAP_BASE_DN,SERVICES)
        >> all_accounts = service.find(LDAP_ADMIN_USER, LDAP_ADMIN_PASS)
        >> print([x.uid for x in all_accounts])

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