Fixed #19582 & #19897 - Added static files tutorial and updated howtos.

tickets:
https://code.djangoproject.com/ticket/19582
https://code.djangoproject.com/ticket/19897

rendered:
http://techytim.com/django/19897/intro/tutorial06.html
http://techytim.com/django/19897/howto/static-files/index.html
http://techytim.com/django/19897/howto/static-files/deployment.html