Swagger-spec-validator

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- Rename package to swagger-spec-validator to fix PyPI upload issues - 59

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- Ignore x- vendor extensions in the schema at the /paths/{path}/{http_method} level - PR 45
- Swagger 2.0 schema synced with upstream - PR 40

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- Fix regression with Swagger 1.2 schemas - 43

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- Fix rich validations that rely on a working deref with scope annotations

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- Support for recursive $refs
- Unqualified $refs no longer supported.
Bad: ``{"$ref": "User"}``
Good: ``{"$ref": "/definitions/User"}``

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- Workaround for validation of Swagger 2.0 schemas with external refs - 38