validating input MMIF based on jsonschema

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As an improvement upon https://github.com/clamsproject/mmif-python/issues/163, we discussed using jsonschema (that's shipped with the mmif-python package found at the runtime) to validate all input MMIFs, instead of relying on version numbers encoded at the top-level of the input MMIS json.

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This has been already the case for input MMIF validation from the beginning. The issue we have (if it's an issue at all) actually isn't json validation, but the "equal" operation between the same vocab types from different versions, which has been discussed in various places (mostly directly in https://github.com/clamsproject/mmif-python/issues/23, but also in https://github.com/clamsproject/mmif-python/issues/14 and https://github.com/clamsproject/mmif-python/issues/163), and our latest conclusion was

• to treat same vocab types as "equal" if the major and minor numbers match.

Closing this as a non-issue.

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It turned out that this WAS NOT the case for the individual apps since https://github.com/clamsproject/clams-python/issues/60. Reopening the issue, and will keep it open until https://github.com/clamsproject/mmif-python/issues/163 is re-closed.