Pyramid-facebook

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* Reusable view and template for OpenGraph objects.
* Support for Facebook local currency payments.

This release is backward-compatible for apps that use the app currency
and Facebook credits decorators. A future version will remove support
for credits (Facebook will remove them) and app currencies (which can now
use the generic OpenGraph view).

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* Packaging fix-ups.

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* Fix bug where permissions defined in `facebook.scope` setting were ignored
by `prompt_authorize`.

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* Add view to redirect from GET canvas to the Facebook application page.

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* Move predicates from lib to predicates.
* Add `PermissionEventPredicate` for filtering event subscriber with permission.

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* Include `pyramid_contextauth` for dealing with context-based authentication.