updated README.md

better formatting and explanations
minor fix in README
README update
README update

explain why Core.iso is included
README update

fixed typo and clarified the terms of use
bug fixed and code improvements

Fixed a bug where the default binding IP for the TFTP server is set to
ip=‘’. By setting the default binding IP to ip=‘0.0.0.0’ then the TFTP
server is accessible by all IPs on the machine.

Improved code in server.py by replacing while True with .isAlive()
statements for the individual threads so that the while loop stays
alive while the threads are alive rather than just an arbitrary ‘True’
Merge pull request #12 from mmattioli/master

Bug Fix, Code Improvements, README.md Updates