Add RSS feed for the jobs board

[dougmellon]

Looking to find out if anyone would be interested in an RSS feed for the job board. As someone that uses RSS heavily, especially for filtering, it would be a useful feature.

[danhannigan]

Same brain! #124 -- that was one of the ideas I tossed onto this brainstorming list a while ago. I think it'd be pretty neat. We don't get a big volume of job posts yet (granted, I'm doing basically nothing to promote it, either).

I have used https://www.npmjs.com/package/feed in the past on a personal project, but didn't dive too deep into it so if there's a particular RSS feed library that you like, then go for it.