Add json2.js to repository under json folder, update build script and app.yaml.template files. This is pretty useful set of functions for JSON manipulation in Javascript, we will mostly use stringify function. This code is on Public Domain license and comes from http://www.json.org/js.html. Patch by: Pawel Solyga Reviewed by: to-be-reviewed

Important roles can now not resign if they are the last in their group. Fixes Issue 288. I've decided to do it outside of the logic because if the need arises to kick the last org admin out of a group we need the ability to do so. Patch by: Lennard de Rijk Reviewed by: to-be-reviewed