How to create custom map tiles and use them in a Leaflet map

This document is testing the functionality of the new dygraphs package with custom CSS as specified by timelyportfolio here: https://gist.github.com/timelyportfolio/cf7b94048ffe7b6a0112

This is a brief write-up to document how I am using IPUMS data with PostgreSQL, R, and dplyr.

This is a short overview of how I've created international population pyramids with ggplot2.