Eliminate render-blocking JavaScript and CSS when they are CDN

I'm getting the infamous Eliminate render-blocking JavaScript and CSS in above-the-fold content on google's PageSpeed. The thing is that all my .js and .css resources are CDN and all of them are minified.

I was able to get rid of the .js warning by adding the async attribute to the <script> as suggested by google but I haven't found a workaround yet for the .css warnings which are foundation.min.css, font-awesome.min.css and fonts.googleapis.com/css?family=Roboto:400,300,900,100. Any suggestions? Thanks.