Update course.yml

_data/course.yml

@@ -2,6 +2,9 @@ title: Course in a Box
 description: Build Your Very Own Open Course
 modules: [start, community, learning, content, feedback, references]
 signups:
+ - name: Dave Cormier
+   https://pbs.twimg.com/profile_images/465974023558418434/NYQWX2pm_400x400.jpeg
+   twitter: davecormier
  - name: Dirk Uys
    image: http://thebacklog.net/img/profile.jpeg
    twitter: riskycud