Clickable link Drag and Drop zoomable D3.js tree example.

Clickable link Drag and Drop zoomable D3.js tree example based on https://gist.github.com/robschmuecker/7880033 for question here: http://stackoverflow.com/questions/24100458/d3-js-drag-and-drop-zoomable-tree-help-in-collapsing-nodes-connected-by-a-certai

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