Cnx-db

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- Fix to only create the moduletags index when it does not exist.

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- Add an index for moduletags to improve search.

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- Fix to speedup in-book search for baked content.

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- Include a migration for the post_publication channel payload change.

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- Add a payload to the post_publication channel notification.
- Fix tests by explicitly including cnx-archive.
- Fix tests to only run trigger tests within Python 2.7.

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- Add a Make recipe for building and serving this project/component.
- Correct styling, documentation and test running code.
- Add the Make interface for common developer tasks.
- Install versioneer for version management via git.
- Add SQL function and trigger to rebake on baking recipe insert or update.
- Update SQL manifest to add subcollection uuid SQL functions.