#317: Productize updater
- added support for sim-less devices (those without IMEI)
 - this is currently useful for troubleshooting other stuff in general with a powerful device Nexus 7 running Android 4.3
 - a device id is calculated as described in Utils.queryDeviceId
 - this includes devices with only wifi or bluetooth
 - tested with Nexus 7 which doesn't have a sim card - see device 3085A9D6F779 on update server
- Managed application cache now updates properly after install

Released as v126
Updated readme.