Allow subscription to work with django 1.5 onwards
Handle the scenario in admin.py where objects do not yet have a pk
Enforce unique=False on the group attribute in class Subscription so that we don't get an IntegrityError when we attempt to point a subscription at an existing group
Check that we are loading up the view function correctly
Set condition to 1.5.0
Override subscription model's save method to handle trial_unit == '0' scenario. That is, no trial unit.
Merge branch 'master' of github.com:calvinchengx/django-subscription
Clean up code and add in condition that handles the scenario when Administrator sets a subscription plan's price to be 0.00. In which case, the paypal form object returned will be None and should be handled by django-subscription user accordingly.
Code clean-up in relation to providing a feature to deal with free subscription plans. i.e. price <= Decimal('0.00')
Merge pull request #8 from calvinchengx/master

Provide support for Django 1.5
Merge branch 'master' of https://github.com/zhaque/django-subscription into HEAD

Conflicts:
	subscription/models.py
	subscription/views.py