Improvements!

Made the error messages display to stderr instead of stdout.  This allows the output to be just the XML result.
Switched from CSV.open to CSV.read.  This allows for actual parsing of CSV files and not just TSV files.
Removed some redundant usage defines.  Only one is necessary.
Changed the import group to be "Import" instead of "Internet".
Added support for reading Password Gorilla CSV exports.
Added support for reading firefox password exporter CSV exports thanks to igorette's code.