Stub of gateway function for adaptive payments
Add support for adaptive payments "Pay" operation

Including example sandbox views
Add adaptive guide
Add support for PaymentDetails operation
The transaction model now records the total amount of the request

Just for audit really.  It makes creating the order source easier later
on when placing an order.
Correct typo in fee enum
Correct handling of receiver amounts

Turns out that the primary receiver amount must be the total for the
entire transaction, covering both the secondary amounts.
Use patch as a decorator
Add support for parallel payments

By default, only chained payment was taken into account with the is_primary parameter giving the total amount for the order.
Merge branch 'master' into feature/adaptive-payments

Conflicts:
	paypal/base.py
	sandbox/apps/checkout/views.py
	sandbox/settings.py
	sandbox/templates/checkout/payment_details.html
Add success view template for Adaptive Payments
Add dashboard views for Adaptive Payments
Support PaymentDetail API
Document Adaptive Payments functionality
Fix amount calculation for chained payments
Correct breadcrumb href
Support Oscar 0.4.x
Add support for python2.6
Merge branch 'master' into feature/adaptive-payments

Conflicts:
	README.rst
	sandbox/apps/checkout/views.py
	sandbox/templates/checkout/payment_details.html
	setup.py
Assume we will be releasing adaptive payments in 0.6.2