Simple bugfix for default_url_options being ignored for named routes

Hi guys,

Just wanted to try my luck to see if anyone is willing to review or
commit a simple patch for default_url_options being ignored for named
routes due to the named routes optimization before it gets too stale:

Details + patch at: http://rails.lighthouseapp.com/projects/8994/tickets/22

Cheers,
Chu Yeow