[Ráfaga] Nº383: validating, boundaries, d3, extent

[Jorge Sanz]

* Open Source to validate 3D geometries
  http://geovalidation.bk.tudelft.nl/val3dity/

* How country boundaries are depending on the visitor IP via @bolosig
  http://jebruner.com/2016/06/geopolitical-hedging-as-a-service/

* How to make D3 maps with a forced layout
  http://mappinglondon.co.uk/2016/data-maps-with-force-layout/

* Comparing country sizes taking projection into account
  http://thetruesize.com

Raf
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