Add support for data diffing about datafire HOT 3 OPEN

shouldnt this be a separate integration? like an action-chain with an actioncalled 'onchange' which only forwards data to another action if there's a diff.
btw. have you looked at this:

http://www.enterpriseintegrationpatterns.com/patterns/messaging/MessageBus.html

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just and idea: maybe there's a small js library with all messaging patterns (throttle, onchange etc) on npm?

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I've been talking with another integration provider about how best to go about this. Each service will probably have a unique way of pushing new items and changes to items. E.g. one service might have support for webhooks that get called each time a new Widget is added, while another service might need to be polled every X minutes to get a list of Widgets.

The big issue is that often we'll need to maintain some kind of state to track which Widgets have been seen already. In some cases, just keeping a local file with a list of IDs might suffice, but in cases with much larger lists you might need a database to help keep track.

I'm going to open another issue for keeping state across action runs - once that's solved I think this one will be a bit easier.

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