Quincuncial Inverse

[shaunlebron]

• https://github.com/d3/d3-geo-projection/blob/master/src/quincuncial.js
• https://github.com/d3/d3-geo-projection/blob/master/src/peirce-quincuncial.js
• https://github.com/d3/d3-geo-projection/blob/master/src/guyou.js

[shaunlebron]

some pseudocode with matlab implementation:
http://arxiv.org/pdf/1011.3189.pdf