it works good enough,

future commits will do some refactors to make the success
screen more user friendly.

	modified:   Makefile
	modified:   README.rst
	modified:   index.html
	modified:   remarkbox/lib/mail.py
	modified:   remarkbox/lib/mail_messages.py
	modified:   remarkbox/models/meta.py
	modified:   remarkbox/models/user.py
	modified:   remarkbox/routes.py
	modified:   remarkbox/templates/join-or-log-in.j2
	modified:   remarkbox/templates/show-node.j2
	new file:   remarkbox/templates/verification-challenge.j2
	modified:   remarkbox/tests/test_models.py
	modified:   remarkbox/tests/test_views.py
	modified:   remarkbox/views/__init__.py
	modified:   remarkbox/views/authentication.py