Pyramid-retry

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- Support a ``retry.activate_hook`` setting which can return a per-request
number of retries. See https://github.com/Pylons/pyramid_retry/pull/4

- Configuration is deferred so that settings may be changed after
``config.include('pyramid_retry')`` is invoked until the configurator
is committed. See https://github.com/Pylons/pyramid_retry/pull/4

- Rename the view predicates to ``last_retry_attempt`` and
``retryable_error``. See https://github.com/Pylons/pyramid_retry/pull/3

- Rename ``pyramid_retry.is_exc_retryable`` to
``pyramid_retry.is_error_retryable``.
See https://github.com/Pylons/pyramid_retry/pull/3

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- Change the default attempts to 3 instead of 1.

- Rename the view predicates to ``is_last_attempt`` and ``is_exc_retryable``.

- Drop support for the ``tm.attempts`` setting.

- The ``retry.attempts`` setting is always set now in
``registry.settings['retry.attempts']`` so that apps can inspect it.

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- Initial release.