Swagger-parser

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* Drop support for python 2.6, add support for python 3.5, python 3.6 and pypy
* Fix issue `35 <https://github.com/Trax-air/swagger-parser/issues/35>`_
* `Add file parser tests and fixes for 40, 41, 42, 43, 44, 45 <https://github.com/Trax-air/swagger-parser/pull/39>`_, thanks to mtherieau
* `Use isinstance for simple type checking <https://github.com/Trax-air/swagger-parser/pull/36>`_, thanks to pankaj28843
* `Fixes for 31, 32, 33 <https://github.com/Trax-air/swagger-parser/pull/34>`_, thanks to crudo10 and beanqueen for the review
* `Bug fix when dictionary only contains 1 element <https://github.com/Trax-air/swagger-parser/pull/30>`_, thanks to TenOs
* `Add tests for "official" petstore json and yaml <https://github.com/Trax-air/swagger-parser/pull/29>`_, thanks to beanqueen

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* Support additionalProperties.

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* Don't choke if there are no definitions
* Generate operations without operationId
* Generate example from properties

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* Support array definitions.

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* Support type field to be an array.
* Use base path to validate request.

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* Support UTF-8 in swagger.yaml.