updated url syntax Django 1.5
Merge branch 'master' of
https://github.com/ennedigi/emencia-django-newsletter.git

Conflicts:
	emencia/django/newsletter/templates/newsletter/newsletter_image_tracking.html
	emencia/django/newsletter/templates/newsletter/newsletter_link_site.html
	emencia/django/newsletter/templates/newsletter/newsletter_link_unsubscribe.html