Revert "Include Font Awesome 4.2.0 (latest stable)"

This reverts commit 9a1a6a6fec9518a08d423310a1ec6dfecd31c0b0.
Use CDN for Font Awesome

Having a local copy of Font Awesome won't work unless we modify the
build to include it. Let's just use the CDN for now to make things easy.

This is the CDN recommended on Font Awesome's website at
http://fortawesome.github.io/Font-Awesome/get-started/ .
Merge branch 'fix-icons-deployment'