Add our s3 path to font-awesome-rails

Instead of creating a variable to change 2 lines of code, I thought it was just as easy to read by editing the 2 lines... so I changed the default paths in the font-awesome-rails gem to our s3 paths.

Because of how cloudfront caches http/https requests and making sure fonts come from our domain (or a referring domain), we sadly need to mod this path in order to make font awesome work with cafewell.