Include fontless css/less files

[jiekang]

I would like to use the Google CDN to acquire Open Sans fonts. Would it be possible for Patternfly to provide css/less files that exclude the font definitions? It's possible for me to remove the definitions during build step but I think it would be cleaner if there were for example patternfly-fontless.min.css and patternfly-fontless.min.less files as part of the Patternfly distribution.