Open an Incognito window in Chrome using shortcut “Command-Option-I” or keyword “incog”.

Credits to http://stackoverflow.com/questions/16064957/how-to-check-in-applescript-if-an-app-is-running-without-launching-it-via-osa | http://www.addictivetips.com/mac-os/force-google-chrome-to-open-in-incognito-mode-using-applescript/ | https://gist.github.com/zdne/7443950