replacing the deprecated jquery .live() function with .on()

Hi
I'm running jquery 1.10+ and the external-links script is breaking my other js code, due to the use of the deperactaed function live() (deperecated since jquery v1.7 - see: http://api.jquery.com/live/).

The function can be found in js/wp-external-links.js and should simply be replaced with the .on() function.

Thanks for updating & also thanks for taking the time to write this great script!

Regards,
Al