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

from django.dispatch import Signal

request_started = Signal()
request_finished = Signal()
got_request_exception = Signal(providing_args=["request"])