update with new links

Update details:

Added in *Sites using SVG*:  
* [How Clean Is England](http://howcleanisengland.keepbritaintidy.org/#)  

Added in *Accessible SVG*:    
* [Invisible Visualization](http://www.w3.org/Talks/2014/schepers_invisible_visualization/index.html)  

Added in *Icons*:  
* [Customizable svg icons css variables](http://codepen.io/AmeliaBR/thoughts/customizable-svg-icons-css-variables)  

Added in *Libraries*:  
* [MetricsGraphics.js](http://metricsgraphicsjs.org/)
* [Charted](http://www.charted.co/)

Added in *Experiments*:  
* [SVG zoom effect](http://www.pencilscoop.com/demos/SVG_Zoom_Effect/)  

Added in *Animations*:  
* [Run, run, Ruuun !](http://codepen.io/CyrilLevallois/pen/JbrfI/)  

Added in  *Tools*:    
* [deSVG](http://benhowdle.im/deSVG/)   

Added in *Basics*:   
* [Getting to the point](http://schepers.cc/getting-to-the-point)