Plugin framework tweak - final

[jglanz]

• All Plugins are registered with init()
• coordinator becomes a class
• plugins are all called centrally, i.e. - it's time to index, so a repo gets all plugins with index capabilities and pushes the model in
• or a repo is created, each store is given the opportunity to decorate it
• Removed bluebird in favor of async/await - which is AMAZING

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Moved to another ticket - good enough for now

• [-] all metadata stored in MetadataManager - which is created with the coordinator instance
• [-] plugin has capabilities
• [-] get,save,remove take rest args for batch, bulk