Updated schema to enforce skill levels.#7

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Schoonology wants to merge 5 commits intomainfrom update-schema

+60-11

Commits on Mar 9, 2018

Update dependencies to latest.
Michael Schoonmaker
committed
Migrate validation to ajv.
Michael Schoonmaker
committed
Extend schema to enforce skill 'levels'.
Michael Schoonmaker
committed
Update styles for new level headers.
Michael Schoonmaker
committed
Migrate to CSON-Parser.
Michael Schoonmaker
committed