get vehicle locations from the nextbus API as JSON
var feed = require('nextbus-live-feed')
var fetchEvery = 1000 * 5
feed('actransit', fetchEver, function onLocation(err, location) {
})
data looks like this:
{
dirTag: "51A_91_1",
heading: "345",
id: "1054",
lastUpdated: "1396983363000",
lat: "37.7824325",
lon: "-122.2763977",
predictable: "true",
routeTag: "51A",
secsSinceReport: "68",
speedKmHr: "5"
}