Use:			http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.quakeml
Instead of: 	http://earthquake.usgs.gov/earthquakes/catalogs/7day-M2.5.xml
The latter has been deprecated: http://earthquake.usgs.gov/earthquakes/feed/policy.php#versions
This page is still broken, but the first step is to update the feed URL.