Fix a few bugs with top level schema definitions

[acao]

• [x] a few tests to demonstrate a few failing test cases
• [ ] fix the top level $ref bug
• [ ] fix the top level allOf bug #73 and #69

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[acao]

@imolorhe from what i can tell it is because our getPointer method skips the object root itself

[imolorhe]

@acao I was able to get it working without touching getPointer. Just touching the completion logic, and all tests are passing!

[imolorhe]

Since I'm on it, want to tackle a few other test cases before creating a PR

[acao]

@imolorhe awesome work! yeah I saw that you added these test cases and todos for the ones left. was awesome to see so many more standard schemas working! closing this for now as the next steps are already in the TODO comments