Clenup JS test. Resolve external $ref during tests.

[IvanGoncharov]

Main improvements:

• cleanup package.json. Mark it as private package to forbid publishing. swagger-validator is totally [different] https://www.npmjs.com/package/swagger-validator) package on npm.
• Update all dependencies related to tests. Biggest update is z-schema.
• Remove tv4 validation. It was failing for long period and was marked as expected. Another point is I'm working on switching unittests from Java to JS as disscussed here, and it easy to do on z-schema but is very hard on tv4.

@webron Can you please review it?

[IvanGoncharov]

@webron I force Travis run on this PR and it pass.
Please review it so I can continue with switching unit tests from Java to JS.

[fehguy]

Hi, all tests for OAI V3 should be against the OpenApi.next branch.

[IvanGoncharov]

@fehguy Hi, thank you for reply.

all tests for OAI V3 should be against the OpenApi.next branch.

It's not intended for OAI V3. It's fixing and improving test for Swagger v2.0.
I'm working with 200+ Swagger 2.0 spec so I'm really interested in improving JSON Schema which validate them. With PRs like #413 but it's blocked by current tests.

Can you please review it?

P.S. same code can be extended to validate OAI V3 in future. So this PR important for both versions.

[IvanGoncharov]

Code is very simple and straightforward and takes only 63 lines after cleanup.

[IvanGoncharov]

@fehguy@webron Can you please take a look?

[IvanGoncharov]

@fehguy Can you please review it?
Especially since you add the same broken test suite into OpenAPI.next as part of #597.

[IvanGoncharov]

@fehguy Thank you.
I will start working on switching unit tests from Java to JS as discussed here.

[webron]

@IvanGoncharov we should probably decide first that that's the current goal. That discussion was prior to the OAI.

[IvanGoncharov]

@webron I understand.
My argument will be that OpenAPI.next should keep JSON Schema in sync with spec changes.
That mean it will benefit from having fully working and maintainable test suite.

As for my personal goals, I want to push few schema fixes to 2.0 or next what will better suit them.
Most important fix is #598.