EVANSTON—WCAS junior Jason Rivers has received many text messages since he purchased an iPhone two years ago, but none stranger than the one he received during his Organic Chemistry class last Tuesday. “WHADDUP NORTHWESTERRRRRRN!” the message read. “Thers a dudewith a gunn n shit so watchouttt.” Rivers, like many other NU students, has been victimized by NU Emergency Notifications, an automated voice designed to help keep students aware of developing emergencies on campus. On Tuesday, the voice had apparently downed