Pyramid-swagger

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* Adds ``dereference_served_schema`` config flag to force served spec to be a
single file. Useful for avoiding mixed-spec inconsistencies when running
multiple versions of your service simultaneously.

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* Add ability for a single spec to serve YAML or JSON to clients
* Support multi-file local specs, serving them over multiple HTTP endpoints
* Improve Swagger validation messages when Pyramid cannot find your route (see 163)
* Bugfix: responses with headers in the spec no longer break request validation (see 159)

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* Support for YAML spec files
* Bugfix: remove extraneous x-scope in digested spec (see https://github.com/Yelp/bravado-core/issues/78)

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* Restore testing of py3x versions
* Support pyramid 1.6 and beyond.
* Support specification of routes using route_prefix

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* Upgrade to bravado-core 3.0.0, which includes a change in the way user-defined formats are registered. See the `Bravado 3.0.0 changelog entry`_ for more detail.

.. _Bravado 3.0.0 changelog entry: http://github.com/Yelp/bravado-core/blob/master/CHANGELOG.rst

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* No longer attempts to validate error responses, which typically don't follow
the same format as successful responses. (Closes: 121)