13cl

Hi!

This adds support for 13.cl (Canal 13) videos.

A sample URL: http://www.13.cl/t13/nacional/el-circulo-de-hierro-de-michelle-bachelet-en-su-regreso-a-la-moneda

This this is my first pull request, I'm not sure I included everything I should. Please let me know if something is missing! Regards.