openlayers/ol3 — pull request #306 by fredj (2013-03-07 09:39:21+00:00)
Title: Activate / deactivate geolocation

Ability to start / stop the geolocation. Use case:
```javascript
var geolocation = new ol.Geolocation();
geolocation.bindTo('position', view);
...
geolocation.track();
...
geolocation.untrack();

```