Generating d3.js motioncharts via rCharts.
Reuses examples from:
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Mike Bostock https://github.com/mbostock/bost.ocks.org/blob/gh-pages/mike/nations/index.html
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Tom Carden https://github.com/RandomEtc/mind-gapper-js
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Ramnath Vaidyanathan, http://stackoverflow.com/a/19729235/454773