$ brew install xhtml2pdf
And install pdftk.
Make pdfs in pdf/, and outputs a slugged csv for Mailchimp
$ ruby generate.rb < file.csv > out.csv
- Make .csv of name,email pairs
 - Run the tool
 - Import the output .csv to Mailchimp (to add the slugs)
 - Put PDFs in https://github.com/manilajs/certificates repo (branch gh-pages)
 - Make a Mailchimp email campaign using the PDFs as mergetags