Add WebTest and some tests

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{{cookiecutter.repo_name}}/requirements/dev.txt

...er.repo_name}}/{{cookiecutter.repo_name}}/public/views.py

...}}/{{cookiecutter.repo_name}}/templates/_layouts/nav.html

...{{cookiecutter.repo_name}}/templates/public/register.html

...repo_name}}/{{cookiecutter.repo_name}}/tests/factories.py

...po_name}}/{{cookiecutter.repo_name}}/tests/test_models.py

..._name}}/{{cookiecutter.repo_name}}/tests/webtest_tests.py