Build automation for OS X
Assume presence of "pip" is sufficient during installation
Further integration with Jinja for better templates

- Support "metadata" from Markdown, file-local substitutions
- Rely on Jinja's template model for loading and processing stylesheets
- Use pisa's Table of Content feature with print intent
  - Markdown's doesn't offer page numbers, which in PDF is valuable
  - Markdown's doesn't automate Outline/Bookmark features for PDF
Preliminary YAML build configuration