block by davo e04ce4721ba3ce702cc0325070a1571a

Update and revert graph data

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This is a follow on from the update data graph used as an example in the book D3 Tips and Tricks.

It demonstrates the loading and reverting of data and updating a graph on button presses. It should be taken in context with the text of the book which can be downloaded for free from Leanpub.