Add script to listen for Mozilla Pulse notifications of Firefox builds

This PR is for issue #31. It will listen for daily and release builds, and trigger the appropriate jobs in Jenkins.
Sounds good. This is a relic we ought to remove. OSX 10.5 was the last 32bit default build. OSX 10.6 came in default 64bit, but you could run a 32b kernel. And from then on all are 64bit.