Add 'loop' mode to process batches of devices

[miguelcardo]

Sometimes we need to deliver the same service to dozens of devices. Executing the command, launching the JVM, etc, may take actually longer than the actual service delivery. So fdsm should implement an optional flag (default value false) to enable a mode in which the command is applied every time a device is detected by the reader. We have something similar in the personalization client.