Adding terminal-notifier entire application

For portability reasons, I had to add the entire project
terminal-notifier (https://github.com/alloy/terminal-notifier), if you
want to use terminal-notifier on your projects, I strongly suggest that
you go on project's page and use it from there.
Adding terminal-notifier bash shortcut
terminal-notifier functionality implemented

Now the script checks if the system is an OSX, and sends a system
notification telling that the IP has changed
Ignoring the files that contains old ips