Chapter discovery

With help from @olizilla in generating initial chapter JSON files for the 56 existing chapter teams (FIFTY SIX!), I've got this hooked up and working locally. I left the design almost completely the same for now, but we'll be able to iterate on this and make better use of the data we'll have for each chapter now (geolocation would be the biggest addition).

I'll merge this later and if it blows up, someone holler and we'll revert.

**Note: biggest change will be the necessity to run `npm run build` after every new JSON file is added. That compiles them all into http://nodeschool.io/chapters/list.json which the client reads for the site.**