PaymentContactInfoForm form_presave signal too late

As of: http://bitbucket.org/chris1610/satchmo/src/a69a9617f962/satchmo/apps/payment/forms.py#cl-234

line 234 and 235 should be switched. Now it emits the form_presave signal AFTER saving the form, which doesn't make sense.

the change as showed here: http://bitbucket.org/wyleung/satchmo/changeset/366fafec3dbf

Fixed in 366fafec3dbf

Thanks!