Pyramid-facebook

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* Fix doc and rst file for pypi.

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* Remove `authentication_policy` decorator in favor of `config.register_authentication_policy`.

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* Update dependency to pyramid_contextauth >= 0.5

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* Add a `GraphAPI` utility lazily instantiated with the application token.
* Add attribute `ChangeNotification.object` event.
* Event `OrderReceived` is notified when receiving a real-time payment update
* Add `pyramid_facebook.tests.integration.test_payments` used in
`pyramid_facebook.tests.functional.test_payments`

Breaking Changes
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* Rename `OrderCreated` for `OrderReceived`

* Can be sent multiple times for the same order with same or different
status

* Rename `OrderCreationError` for `OrderProcessingError`

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* Added pfacebook-real-time command to update real time subscriptions.
* Breaking changes: namespace is now added by the framework in opengraph URLs.