wip: extract all uniq font awesome

fa-on-diet.sh

grep -r "fa-" \
  --include=\*.{rb,haml,jst,js} \
  --exclude=\*xregexp\* \
  --exclude-dir={public,.//app/assets/javascripts/i18n,.//app/assets/javascripts/i18n/web} \
  ./ \
  > icons.txt


ruby -e 'File.read("./icons.txt").scan(/(fa(?:-\w+)+)/).flatten.uniq'

#TODO: custom build via font fontello_rails_converter