Changed newsletter models structure
Added south to INSTALLED_APPLICATIONS
Minor fixes
Fixed bug
Deleted ACTIVE_NEWSLETTER var. Changed views to new newsletter models
Fixed enconding error with uuid4 method
Removed wrong south scripts
Migrations to new models
Added urls to newsletter access
Added new views to get and send newsletter
Added NewsletterManager to Newsletter model
Adding new newsletter views
Merge branch 'update_newsletter_models' of github.com:python-spain/pycones-web into update_newsletter_models
Added Subscription model to administrator
Updated Newsletter unicode method and added to Subscription model
Added access to last newsletter
Added new views get_last_newsletter and get_newsletter
Fixed get_newsletter and send_newsletter urls
New template to view newsletter details
Added get_article url