fix /stations/all 🐛

Although this is a breaking change, it changes the API to behave
as documented. :(

lib/all-stations.js

@@ -1,11 +1,27 @@
 'use strict'
 
-const file = require.resolve('db-stations/full.ndjson')
+let raw = require('db-stations/full.json')
+
+let data = {}
+for (let key in raw) {
+	if (!Object.prototype.hasOwnProperty.call(raw, key)) continue
+	const station = Object.assign({}, raw[key]) // clone
+
+	// todo: remove this remapping (breaking change!)
+	station.coordinates = station.location
+	delete station.location
+
+	data[station.id] = station
+}
+data = JSON.stringify(data) + '\n'
+raw = null
 
 const allStations = (req, res, next) => {
-	res.sendFile(file, {
+	// res.sendFile(rawPath, {
-		maxAge: 10 * 24 * 3600 * 1000 // 10 days
+	// 	maxAge: 10 * 24 * 3600 * 1000 // 10 days
-	}, next)
+	// }, next)
+	res.set('content-type', 'application/json')
+	res.send(data)
 }
 
 module.exports = allStations