Fixing up TripIt and Dopplr Integration

I’ve had my TripIt Personal Calendar Feed specified as an iCal feed into Dopplr for some time, to keep the two in sync by adding every trip in TripIt into Dopplr automatically (I’d give up on Dopplr entirely, as it seems a bit overdesigned and buggy - but it is a bit shinier than TripIt and produces nicer stats, so I’m hanging on to using it against my better judgement). But unfortunately the folks at TripIt broke this integration recently by adding exact geographic locations to the feed.