OpenLayers+ GeoJSON with Z coordinates

HTML

<script src="http://www.openlayers.org/dev/OpenLayers.js"></script>
 <div id="map" class="smallmap"></div>

CSS

.smallmap{
    width:500px;
    height:300px;
}

JavaScript

var lon = 5;
var lat = 10;
var zoom = 2;
var map, layer;
var geojson_format ;
var data={
	"type" : "FeatureCollection",
	"metadata" : {
		"generated" : 1382079580000,
		"url" : "http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson?%2053324",
		"title" : "USGS Magnitude 2.5+ Earthquakes, Past Day",
		"status" : 200,
		"api" : "1.0.11",
		"count" : 21
	},
	"features" : [{
			"type" : "Feature",
			"properties" : {
				"mag" : 4.9,
				"place" : "69km WSW of Panguna, Papua New Guinea",
				"time" : 1382072700910,
				"updated" : 1382074535000,
				"tz" : 600,
				"url" : "http://earthquake.usgs.gov/earthquakes/eventpage/usb000kg7b",
				"detail" : "http://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/usb000kg7b.geojson",
				"felt" : null,
				"cdi" : null,
				"mmi" : null,
				"alert" : null,
				"status" : "reviewed",
				"tsunami" : null,
				"sig" : 369,
				"net" : "us",
				"code" : "b000kg7b",
				"ids" : ",usb000kg7b,",
				"sources" : ",us,",
				"types" : ",cap,general-link,geoserve,nearby-cities,origin,phase-data,tectonic-summary,",
				"nst" : null,
				"dmin" : 8.182,
				"rms" : 0.95,
				"gap" : 86,
				"magType" : "mb",
				"type" : "earthquake",
				"title" : "M 4.9 - 69km WSW of Panguna, Papua New Guinea"
			},
			"geometry" : {
				"type" : "Point",
				"coordinates" : [154.9386, -6.6267, 38.4]
			},
			"id" : "usb000kg7b"
		}, {
			"type" : "Feature",
			"properties" : {
				"mag" : 4.3,
				"place" : "30km ESE of Jarm, Afghanistan",
				"time" : 1382069641720,
				"updated" : 1382071013039,
				"tz" : 270,
				"url" : "http://earthquake.usgs.gov/earthquakes/eventpage/usb000kg6q",
				"detail" : "http://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/usb000kg6q.geojson",
				"felt" : 0,
				"cdi" : 1,
				"mmi" : null,
				"alert" : null,
				"status" : "reviewed",
				"tsunami" : null,
				"sig" : 284,
				"net" : "us",
				"code" : "b000kg6q",
				"ids" : ",usb000kg6q,",
				"sources" : ",us,",
				"types" :...