Pyramid-swagger

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* Support `include_missing_properties` bravado-core flag in pyramid configuration
* Outsource flattening logic to bravado-core library.
* Expose bravado-core ``operation`` in request object
* Add ``pyramid_renderer`` and ``PyramidSwaggerRendererFactory``

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* Bugfix: add a quick fix to prevent resolve_refs from making empty json keys on external refs (see 206)

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* Bugfix: prevent resolve_refs from resolution failures when flattening specs with recursive $refs (see 204)
* Allow serving of api_docs from paths besides /api_docs (see 187)
* Support virtual hosting via SCRIPT_NAME (see 201 and https://www.python.org/dev/peps/pep-0333/)

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* Fix reading configuration values from INI files (see 182, 200)

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* Fix validation context for swagger 2.0 requests
* Added docs for validation context
* Preserved original exception when reraising for validation context exceptions
* Remove support for Python 2.6, newer Pyramid versions don't support it either
* Fix issue with missing content type when using webob >= 1.7 (see 185)

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* Fix installation with Python 3 on systems using a POSIX/ASCII locale.