Updated font-awesome CDN refs bump 4.2.0 adding 40 new icons

As mentioned, changes to the html5 renderer to reflect latest version adding 40 new icons available to the inline icon macro. See [here for an overview](http://fortawesome.github.io/Font-Awesome/whats-new/#new) of how the icons look and what the names are (and consequently how they can be called from asciidoc ;)

Also updated the references in unit tests.