print controller doesn't work with Routes 1.12

[elemoine]

the print controller uses url_for(action=action) and relies on Route Memory (*). And the defaults of Routes have changed in 1.12 with regards to Route Memory, Route Memory is considered bad practice and is now disabled by default.

(*) http://pylonsbook.com/en/1.1/urls-routing-and-dispatch.html#route-memory

[elemoine]

patch-server-560-r3385-A0.diff fixes it. The controller name is hardcoded as the user cannot use another name than printer.py for the print controller file, this is because the controller class name is PrinterController.

Please review.

[bbinet]

Looks good to me. Please commit.

[elemoine]

(In [3386]) print controller doesn't work with Routes 1.12, r=bbinet (closes #560)