I configured GitHub's web hooks for a project and pushed code, but the job didn't build. I captured the payload with PostBin: http://www.postbin.org/sq1n8a ; then sent it with Curl to see what was going on:

curl -k -H 'Content-Type: application/x-www-form-urlencoded' -XPOST https://ci.public.simplegeo.com/github-webhook/ -d@x.js

I received this stacktrace in response: https://gist.github.com/1095538