Updated to FontAwesome 3.0.1

Please consider this pull request that updates your converter script to support the additional icons in the current FontAwesome version 3.0.1

I also added in a simple check when there's a problem with a character code so the script will skip past it and continue processing (possibly happening when the FontAwesome font version doesn't match the version expected by the script..?)

Lastly I updated the readme with a little more information for installation and troubleshooting