unreleased
==========

Features
--------

- Added an execution policy hook to the request pipeline. An execution
  policy has the ability to control creation and execution of the request
  objects before they enter rest of the pipeline. This means for a given
  request that the policy may create more than one request for retry
  purposes. See https://github.com/Pylons/pyramid/pull/2964

Bug Fixes
---------

- HTTPException's accepts a detail kwarg that may be used to pass additional
  details to the exception. You may now pass objects so long as they have a
  valid __str__ method. See https://github.com/Pylons/pyramid/pull/2951 

Deprecations
------------

Backward Incompatibilities
--------------------------

Documentation Changes
---------------------