Start and stop GPS listening in play() and pause() (issue #174)

Author: nickw1

aframe/src/location-based/gps-camera.js

@@ -112,6 +112,9 @@ AFRAME.registerComponent('gps-camera', {
 
         window.addEventListener(eventName, this._onDeviceOrientation, false);
 
+    },
+
+    play: function() {
         this._watchPositionId = this._initWatchGPS(function (position) {
             var localPosition = {
                 latitude: position.coords.latitude,
@@ -155,11 +158,14 @@ AFRAME.registerComponent('gps-camera', {
         this._updateRotation();
     },
 
-    remove: function () {
+    pause: function() {
         if (this._watchPositionId) {
             navigator.geolocation.clearWatch(this._watchPositionId);
         }
         this._watchPositionId = null;
+    },
+
+    remove: function () {
 
         var eventName = this._getDeviceOrientationEventName();
         window.removeEventListener(eventName, this._onDeviceOrientation, false);