multiple authors and subtitles in Rmarkdown yaml

Question

I'm trying to follow this pandoc example to add multiple authors to an Rmarkdown file in the yaml metadata block. The pdf will generate in RStudio (Version 0.98.932), but there is no author information.

---
title:  'This is the title: it contains a colon'
author:
- name: Author One
  affiliation: University of Somewhere
- name: Author Two
  affiliation: University of Nowhere
date: "`r format(Sys.time(), '%d %B %Y')`"
tags: [nothing, nothingness]
abstract: |
  This is the abstract.

  It consists of two paragraphs.
output: pdf_document
---

I'd also like to customize the heading a bit more and add a subtitle. Possible?

Answer 1

I just found out that it is possible to add subtitles to R markdown PDF output. I am using R 3.2.2 and RStudio 0.99.473 in Ubuntu 14.04.

---
title:  'This is the title: it contains a colon'
subtitle: 'This is the subtitle'
output: pdf_document
---