Some improvements, bugfix

Added 'timeout', 'count', 'numDataBytes', 'path_finder' parameters;
Change name of method from 'isAvail' to 'getStats' as more suitable by
capabilities;
Added functionality to set range of subnetwork address to check
available;
Set parameter 'daemon=True', because not all of the child processes
exits correctly and became zombies, when all work is already done;
Now method 'getStats' return object-queue, that user can use as he want.