Install pandoc from RStudio

.travis.yml

@@ -22,7 +22,19 @@ cache:
     - $HOME/.ccache
 
 install:
+  # Install binary pandoc from Rstudio
+  - export PATH="$HOME/pandoc:$PATH"
+  - mkdir $HOME/pandoc
+  - curl -O https://s3.amazonaws.com/rstudio-buildtools/pandoc-1.12.3.zip
+  - unzip -j pandoc-1.12.3.zip pandoc-1.12.3/linux/debian/x86_64/pandoc
+      -d $HOME/pandoc
+  - chmod +x $HOME/pandoc/pandoc
+  - pandoc --version
+
+  # Install ruby gems
   - bundle install --jobs=3 --retry=3
+
+  # Install R packages
   - mkdir -p "$R_LIBS_USER"
   - Rscript -e 'if (length(find.package("devtools", quiet = TRUE)) == 0L) { install.packages("devtools", repos = "http://cran.rstudio.com") }'
   - Rscript -e 'devtools::install_github("hadley/devtools")'