The file support/icons.json has a machine-readable JSON representation of the
icon fonts.
It is auto-generated by Rake.
Type rake to auto-build the reference file (index.html) and the JSON
manifest.
$ rake
==> Writing support/icons.json
==> Updating index.html
$ open index.html
or online: http://rstacruz.github.io/sass_icon_fonts
$ git push origin master:gh-pages