Add rubygem-po_to_json 1.0.1

PoToJson converts gettext PO files to JSON to use in your javascript app, based
on po2json.pl by DuckDuckGo, Inc.. Ideally you'll use this on a Rake task that
creates JSON versions of your PO files, which can later be used from javascript
with Jed.

WWW: https://github.com/webhippie/po_to_json