Update Request: Des Moines interchange "ramp" removal

Hi Brent. I’ve changed things up there. It was initially meant as an attempt to at least prompt a Wazer one way or another given the scale of the western mixmaster there in Des Moines. On the northbound side heading south it’s a bit of a major split given two interstates split and I tried to balance that out. For now I’m removing the wayfinders on both sides. Ideally a "Continue … " command would be great but we only have turn, stay and exit at our disposal.

The changes should go live here soon (depending on the next NA map tile release http://status.waze.com).

Thanks!