Re-add `package.json` for older CommonJS environments.
Re-add `package.json` for older CommonJS environments.

bestiejs/json3,mcanthony/json3,jcoc611/cassandraMAP,yetone/json3,jcoc611/cassandraMAP,tildeio/kamino.js,oyvindkinsey/json3,bestiejs/json3,cyril-sf/kamino.js,mcanthony/json3,yetone/json3