Adding 'WebFont' 1.3.0.

Straight from http://ajax.googleapis.com/ajax/libs/webfont/1.3.0/webfont.js.

[![Build Status](https://secure.travis-ci.org/bmcustodio/cdnjs.png?branch=webfont-1.3.0)](https://travis-ci.org/bmcustodio/cdnjs)