diff --git a/README b/README
--- a/README
+++ b/README
@@ -3598,8 +3598,9 @@
 with the `src` attribute.  For example:
 
     <audio controls="1">
-     <source src="http://www.sixbarsjail.it/tmp/bach_toccata.mp3"
-     data-external="1" type="audio/mpeg"></source>
+      <source src="http://example.com/music/toccata.mp3"
+              data-external="1" type="audio/mpeg">
+      </source>
     </audio>
 
 Literate Haskell support
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,12 @@
+pandoc (1.15.2.1)
+
+  * Added two missing test files, and `stack.yaml`, to
+    `extra-source-files` so they're included in the source tarball.
+
+  * reveal.js template: Fixed parallaxBackground options.
+    `parallaxBackgroundHorizontal` and `parallaxBackgroundVertical`
+    need integer values, not strings.  (Vaughn Iverson)
+
 pandoc (1.15.2)
 
   * `pandoc my.md -t context -o my.pdf` will now create a PDF using
@@ -112,8 +121,9 @@
     the tags linking to media that should not be downloaded.  Example:
 
         <audio controls="1">
-         <source src="http://www.sixbarsjail.it/tmp/bach_toccata.mp3"
-         type="audio/mpeg"></source>
+          <source src="http://example.com/music/toccata.mp3"
+                  data-external="1" type="audio/mpeg">
+          </source>
         </audio>
 
   * HTML writer:  use width on whole table if col widths sum to < 100%.
diff --git a/data/templates/default.revealjs b/data/templates/default.revealjs
--- a/data/templates/default.revealjs
+++ b/data/templates/default.revealjs
@@ -198,10 +198,10 @@
 $if(parallaxBackgroundHorizontal)$
         // Amount to move parallax background (horizontal and vertical) on slide change
         // Number, e.g. 100
-        parallaxBackgroundHorizontal: '$parallaxBackgroundHorizontal$',
+        parallaxBackgroundHorizontal: $parallaxBackgroundHorizontal$,
 $endif$
 $if(parallaxBackgroundVertical)$
-        parallaxBackgroundVertical: '$parallaxBackgroundVertical$',
+        parallaxBackgroundVertical: $parallaxBackgroundVertical$,
 $endif$
 $if(width)$
         // The "normal" size of the presentation, aspect ratio will be preserved
diff --git a/man/pandoc.1 b/man/pandoc.1
--- a/man/pandoc.1
+++ b/man/pandoc.1
@@ -1,5 +1,5 @@
 .\"t
-.TH PANDOC 1 "November 12, 2015" "pandoc 1.15.2"
+.TH PANDOC 1 "November 12, 2015" "pandoc 1.15.2.1"
 .SH NAME
 pandoc - general markup converter
 .SH SYNOPSIS
@@ -4491,8 +4491,9 @@
 .nf
 \f[C]
 <audio\ controls="1">
-\ <source\ src="http://www.sixbarsjail.it/tmp/bach_toccata.mp3"
-\ data\-external="1"\ type="audio/mpeg"></source>
+\ \ <source\ src="http://example.com/music/toccata.mp3"
+\ \ \ \ \ \ \ \ \ \ data\-external="1"\ type="audio/mpeg">
+\ \ </source>
 </audio>
 \f[]
 .fi
diff --git a/pandoc.cabal b/pandoc.cabal
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -1,5 +1,5 @@
 Name:            pandoc
-Version:         1.15.2
+Version:         1.15.2.1
 Cabal-Version:   >= 1.10
 Build-Type:      Custom
 License:         GPL
@@ -113,6 +113,8 @@
                  -- documentation
                  INSTALL, BUGS, CONTRIBUTING.md, changelog
                  man/pandoc.1
+                 -- stack build plan
+                 stack.yaml
                  -- files needed to build man page
                  man/capitalizeHeaders.hs
                  man/removeNotes.hs
@@ -187,6 +189,8 @@
                  tests/writer.fb2
                  tests/writer.opml
                  tests/writer.dokuwiki
+                 tests/writers-lang-and-dir.latex
+                 tests/writers-lang-and-dir.context
                  tests/dokuwiki_inline_formatting.dokuwiki
                  tests/lhs-test.markdown
                  tests/lhs-test.markdown+lhs
diff --git a/stack.yaml b/stack.yaml
new file mode 100644
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,11 @@
+flags:
+  pandoc:
+    trypandoc: false
+    https: true
+    embed_data_files: false
+    old-locale: false
+    network-uri: true
+packages:
+- '.'
+extra-deps: []
+resolver: lts-3.13
diff --git a/tests/writers-lang-and-dir.context b/tests/writers-lang-and-dir.context
new file mode 100644
--- /dev/null
+++ b/tests/writers-lang-and-dir.context
@@ -0,0 +1,113 @@
+% Enable hyperlinks
+\setupinteraction
+  [state=start,
+  style=,
+  color=,
+  contrastcolor=]
+% make chapter, section bookmarks visible when opening document
+\placebookmarks[chapter, section, subsection, subsubsection, subsubsubsection, subsubsubsubsection][chapter, section]
+\setupinteractionscreen[option=bookmark]
+\setuptagging[state=start]
+
+% use microtypography
+\definefontfeature[default][default][protrusion=quality,expansion=quality,onum=yes,pnum=yes]
+\definefontfeature[smallcaps][smallcaps][protrusion=quality,expansion=quality,onum=yes,pnum=yes]
+\setupalign[hz,hanging]
+\setupbodyfontenvironment[default][em=italic] % use italic as em, not slanted
+\setupbodyfont[mainfont]
+\setupwhitespace[medium]
+
+\setuphead[chapter]            [style=\tfd,header=empty]
+\setuphead[section]            [style=\tfc]
+\setuphead[subsection]         [style=\tfb]
+\setuphead[subsubsection]      [style=\bf]
+\setuphead[subsubsubsection]   [style=\sc]
+\setuphead[subsubsubsubsection][style=\it]
+
+\setuphead[chapter, section, subsection, subsubsection, subsubsubsection, subsubsubsubsection][number=no]
+
+\definedescription
+  [description]
+  [headstyle=bold, style=normal, location=hanging, width=broad, margin=1cm, alternative=hanging]
+
+\setupitemize[autointro]    % prevent orphan list intro
+\setupitemize[indentnext=no]
+
+\setupfloat[figure][default={here,nonumber}]
+\setupfloat[table][default={here,nonumber}]
+
+\setupthinrules[width=15em] % width of horizontal rules
+
+\setuphead[title][
+  style={\tfd\raggedcenter},
+  before={\startalignment[middle]},
+  after={
+    \bigskip\stopalignment}]
+
+
+\starttext
+
+\section[empty-divs-and-spans]{Empty Divs and Spans}
+
+Some text and
+
+div contents
+
+and more text.
+
+Next paragraph with a span and a word-thatincludesaspanright?
+
+\section[directionality]{Directionality}
+
+Some text and
+
+\startalignment[righttoleft]
+rtl div contents
+
+\stopalignment
+
+and more text.
+
+\startalignment[lefttoright]
+and a ltr div. with a {\righttoleft rtl span}.
+
+\stopalignment
+
+Next paragraph with a {\righttoleft rtl span} and a
+word-that-includesa{\lefttoright ltrspan}right?
+
+\section[languages]{Languages}
+
+Some text and
+
+\start\language[de]
+German div contents
+
+\stop
+
+and more text.
+
+Next paragraph with a \start\language[en-gb]British span\stop  and a
+word-that-includesa\start\language[de-ch]Swiss German span\stop right?
+
+Some \start\language[es]Spanish text\stop .
+
+\section[combined]{Combined}
+
+Some text and
+
+\start\language[fr]
+\startalignment[righttoleft]
+French rtl div contents
+
+\stopalignment
+\stop
+
+and more text.
+
+Next paragraph with a \start\language[en-gb]{\lefttoright British ltr
+span}\stop  and a
+word-that-includesa\start\language[de-ch]{\lefttoright Swiss German ltr
+span}\stop right?
+
+\stoptext
diff --git a/tests/writers-lang-and-dir.latex b/tests/writers-lang-and-dir.latex
new file mode 100644
--- /dev/null
+++ b/tests/writers-lang-and-dir.latex
@@ -0,0 +1,145 @@
+\documentclass[english,]{article}
+\usepackage{lmodern}
+\usepackage{amssymb,amsmath}
+\usepackage{ifxetex,ifluatex}
+\usepackage{fixltx2e} % provides \textsubscript
+\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
+  \usepackage[T1]{fontenc}
+  \usepackage[utf8]{inputenc}
+\else % if luatex or xelatex
+  \ifxetex
+    \usepackage{mathspec}
+  \else
+    \usepackage{fontspec}
+  \fi
+  \defaultfontfeatures{Ligatures=TeX,Scale=MatchLowercase}
+  \newcommand{\euro}{€}
+\fi
+% use upquote if available, for straight quotes in verbatim environments
+\IfFileExists{upquote.sty}{\usepackage{upquote}}{}
+% use microtype if available
+\IfFileExists{microtype.sty}{%
+\usepackage{microtype}
+\UseMicrotypeSet[protrusion]{basicmath} % disable protrusion for tt fonts
+}{}
+\usepackage{hyperref}
+\PassOptionsToPackage{usenames,dvipsnames}{color} % color is loaded by hyperref
+\hypersetup{unicode=true,
+            pdfborder={0 0 0},
+            breaklinks=true}
+\urlstyle{same}  % don't use monospace font for urls
+\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
+  \usepackage[shorthands=off,ngerman,british,ngerman,spanish,french,main=english]{babel}
+  \newcommand{\textgerman}[2][]{\foreignlanguage{ngerman}{#2}}
+  \newenvironment{german}[1]{\begin{otherlanguage}{ngerman}}{\end{otherlanguage}}
+  \newcommand{\textenglish}[2][]{\foreignlanguage{british}{#2}}
+  \newenvironment{english}[1]{\begin{otherlanguage}{british}}{\end{otherlanguage}}
+  \let\oritextspanish\textspanish
+  \AddBabelHook{spanish}{beforeextras}{\renewcommand{\textspanish}{\oritextspanish}}
+  \AddBabelHook{spanish}{afterextras}{\renewcommand{\textspanish}[2][]{\foreignlanguage{spanish}{##2}}}
+  \newcommand{\textfrench}[2][]{\foreignlanguage{french}{#2}}
+  \newenvironment{french}[1]{\begin{otherlanguage}{french}}{\end{otherlanguage}}
+\else
+  \usepackage{polyglossia}
+  \setmainlanguage[]{english}
+  \setotherlanguage[]{german}
+  \setotherlanguage[variant=british]{english}
+  \setotherlanguage[variant=swiss]{german}
+  \setotherlanguage[]{spanish}
+  \setotherlanguage[]{french}
+\fi
+\setlength{\parindent}{0pt}
+\setlength{\parskip}{6pt plus 2pt minus 1pt}
+\setlength{\emergencystretch}{3em}  % prevent overfull lines
+\providecommand{\tightlist}{%
+  \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
+\setcounter{secnumdepth}{0}
+\ifxetex
+  % load bidi as late as possible as it modifies e.g. graphicx
+    \usepackage{bidi}
+  \fi
+\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
+  \TeXXeTstate=1
+  \newcommand{\RL}[1]{\beginR #1\endR}
+  \newcommand{\LR}[1]{\beginL #1\endL}
+  \newenvironment{RTL}{\beginR}{\endR}
+  \newenvironment{LTR}{\beginL}{\endL}
+\fi
+
+\date{}
+
+% Redefines (sub)paragraphs to behave more like sections
+\ifx\paragraph\undefined\else
+\let\oldparagraph\paragraph
+\renewcommand{\paragraph}[1]{\oldparagraph{#1}\mbox{}}
+\fi
+\ifx\subparagraph\undefined\else
+\let\oldsubparagraph\subparagraph
+\renewcommand{\subparagraph}[1]{\oldsubparagraph{#1}\mbox{}}
+\fi
+
+\begin{document}
+
+\section{Empty Divs and Spans}\label{empty-divs-and-spans}
+
+Some text and
+
+div contents
+
+and more text.
+
+Next paragraph with a span and a word-thatincludesaspanright?
+
+\section{Directionality}\label{directionality}
+
+Some text and
+
+\begin{RTL}
+rtl div contents
+\end{RTL}
+
+and more text.
+
+\begin{LTR}
+and a ltr div. with a \RL{rtl span}.
+\end{LTR}
+
+Next paragraph with a \RL{rtl span} and a
+word-that-includesa\LR{ltrspan}right?
+
+\section{Languages}\label{languages}
+
+Some text and
+
+\begin{german}
+
+German div contents
+
+\end{german}
+
+and more text.
+
+Next paragraph with a \textenglish[variant=british]{British span} and a
+word-that-includesa\textgerman[variant=swiss]{Swiss German span}right?
+
+Some \textspanish{Spanish text}.
+
+\section{Combined}\label{combined}
+
+Some text and
+
+\begin{RTL}
+\begin{french}
+
+French rtl div contents
+
+\end{french}
+\end{RTL}
+
+and more text.
+
+Next paragraph with a \LR{\textenglish[variant=british]{British ltr
+span}} and a word-that-includesa\LR{\textgerman[variant=swiss]{Swiss
+German ltr span}}right?
+
+\end{document}
