There's an app for that too, named 'Placed' it will detect an iBeacon and launch another app. Check it at https://itunes.apple.com/fr/app/placed-location-based-app/id738980786?mt=8&affId=1306247&ign-mpt=uo%3D4.
Now where can we buy some iBeacons ? How do we integrate that with Indigo ?