Django-nomad-notifier

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* No need to define attributes for template paths in models subclassing
Notification, to discover the path the class first tries to
generate them joining an attribute defining the prefix name and a
pre-defined set of suffixes.
* Enabled a url/view to delete notifications, along with a default
template ready to be overriden with the rest.

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* Added a new self.get_language() method that receives a
language code used to render templates translated.

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* Added notification type field to be able to have web only,
email only or web & email notifications.

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* Made Notification.user nullable, so we can create
non user-attached notifications.

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* Fixed migrations, add django-model-utils dependency

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* Add SITE_URL setting to stop using django.contrib.sites