NumberPicture.js becomes Potion

With some exciting new developments on the NumberPicture.js project we have decided to give it a new name: Potion.

We refactored the library out into several submodules: @potion/element for shapes and elements, @potion/layout for visualization layouts, @potion/extra for extras like patterns, gradients and axes and @potion/util for utility functions used when constructing visualizations.

You can find the new docs at: http://numberpicture.com/build