Set fig.path in tools/chunk-options.R to send all plots to fig/ by

library("knitr")

opts_chunk$set(tidy = FALSE, results = "markup", comment = NA,

               fig.align = "center")

               fig.align = "center", fig.path = "fig/")

# The hooks below add html tags to the code chunks and their output so that they

# are properly formatted when the site is built with jekyll.