Added 'Cancel' action in Secretary which enables the admin user to cancel a specific registration

Cancelling will cause :

- payed = false
- cancelled = true
- metadata-> BecomeMember = false

Will not be allowed if the person in question is part of the praesidium

Signed-off-by: DarioI <dario.incalza@litus.cc>
Merge branch 'master' of https://github.com/LitusProject/Litus into dev-membershipaction
Some improvements
Used Ajax for canceling a registration

Also added a modal asking the user to be sure.

Signed-off-by: DarioI <dario.incalza@litus.cc>
Small fixes
change cancelled cell on registration cancelled

Someone an idea what I'm doing wrong ? This is not working.

Signed-off-by: DarioI <dario.incalza@litus.cc>
Merge branch 'dev-membershipaction' of https://github.com/LitusProject/Litus into dev-membershipaction

Signed-off-by: DarioI <dario.incalza@litus.cc>

Conflicts:
	module/SecretaryBundle/Resources/views/secretary/admin/registration/manage.twig
fix merge

Signed-off-by: DarioI <dario.incalza@litus.cc>
fix

Signed-off-by: DarioI <dario.incalza@litus.cc>
Merge remote-tracking branch 'LitusProject/master' into dev-membershipaction
Some registration cancellation fixes