adding geojson

Converted [json stream](http://norfolkart.herokuapp.com/) via [Issue #24](https://github.com/c4hrva/norfolkart/issues/24) using @konklone 's [json to csv](http://konklone.io/json/) converter then used @mapbox 's [geojson.io](http://geojson.io) to convert csv to geojson. Points can be viewed directly in GitHub and can even be edited on the fly using the github/geojson [chrome plugin](https://chrome.google.com/webstore/detail/geojsonio/oibjgofbhldcajfamjganpeacipebckp?hl=en-US)