jschain: map with d3 (#10)

I used d3 to make a map. It was good practice. I had forgotten how d3?s chaining API works. When a function mutates an element, it returns the same element back. When a function appends something to an element, it returns the new element back.

I also tried using patterns in svg. I still have to learn some more to understand them and to get the results I want, and I also need to brush up on biezer curves.

Update: I adjusted the vertical offset of the pattern to remove gaps between states.



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