update jingo: use jingo.Loader template loader, jingo.monkey.patch instead of safe_django_forms
update jingo: direct_to_template deprecated, use TemplateView
update jingo: Template.render only accepts a dictionnary
update jingo: use django.shortcuts.render instead of jingo.render
update jingo: prevent request.user to be overwritten by context's user
update jingo: install gettext in jingo.env.globals during tests
update jingo: convert jingo.helpers.f input to string to allow |safe
update jingo: update Jinja2 from 2.7.1 to 2.7.2