Exclude users paying through bank transfer from monthly check

Hi Rasmus,

I have added a field to the user's profile (using UPME custom fields, only visible and editable by admins):

![captura de pantalla de 2014-08-28 15 50 50](https://cloud.githubusercontent.com/assets/452823/4076477/74d298e2-2eba-11e4-89bb-7f5ac80335ac.png)

If it is set to "Bank", then the user is excluded from the monthly check. I suppose there are a lot of bank users, and editing all of them is going to be a pain. Maybe we need something to automatise this?

Regards,
Ignacio