Use django-crispy-forms for DRY forms. Because writing forms is a tedious
task.

DRY = Don't Repeat Yourself

See:
https://readthedocs.org/projects/django-crispy-forms/
http://django-crispy-forms.readthedocs.org/en/latest/
Account django-app ORM model.

Closes #8.
Add /accounts/signup/ url.
Add South migration tool (3rd party app) to our settings.

See: http://south.readthedocs.org/en/latest/index.html
Closes #18.
Create database objects for the 'accounts' app using South.
Add Signup workflow.
Hide the content password field in the signup form.
Link the signup button to the signup form.
Welcome the logged user in the navbar.
Add login template. Based on Bootstrap's SignIn example.

See: http://getbootstrap.com/examples/signin/

Closes #19.
Add SignUp logic
Link the Login button from the navbar to the login form