Generate base template and inherit this template in all the files under templates/

Merge branch 'master' of git@github.com:juananpe/tangowithdjango.git

Conflicts:
	tango_with_django_project/rango/forms.py
	tango_with_django_project/rango/urls.py
	tango_with_django_project/rango/views.py
	tango_with_django_project/templates/rango/index.html