Remove hack for issue that is now fixed.

Stringifying was to get around this issue:
mapbox/mapbox-gl-js#2434

Removing since this is now resolved.

public/javascripts/convert.js

@@ -2,9 +2,7 @@
 let locationToFeature = (location) => {
   location["marker-symbol"] = "marker"
   location.title = location.organizations.reduce((prev, curr) => { return prev === "" ? prev + curr.name : prev + " & " + curr.name}, "")
-  //XXX: This is a workaround for
-  //https://github.com/mapbox/mapbox-gl-js/issues/2434
-  location.organizations = JSON.stringify(location.organizations)
+  location.organizations = location.organizations
   return {
     "type": "Feature",
     "properties": location,