also update devel rstudio version detection

rstudio/devel/Dockerfile

 FROM rocker/r-ver:devel
 
 ARG RSTUDIO_VERSION
+#ENV RSTUDIO_VERSION=${RSTUDIO_VERSION:-1.1.463}
 ARG S6_VERSION
+ARG PANDOC_TEMPLATES_VERSION
 ENV S6_VERSION=${S6_VERSION:-v1.21.7.0}
 ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
 ENV PATH=/usr/lib/rstudio-server/bin:$PATH
+ENV PANDOC_TEMPLATES_VERSION=${PANDOC_TEMPLATES_VERSION:-2.6}
 
 ## Download and install RStudio server & dependencies
 ## Attempts to get detect latest version, otherwise falls back to version given in $VER
@@ -19,21 +22,29 @@ RUN apt-get update \
     libssl-dev \
     lsb-release \
     psmisc \
+    procps \
     python-setuptools \
     sudo \
     wget \
+    libclang-dev \
+    libclang-3.8-dev \
+    libobjc-6-dev \
+    libclang1-3.8 \
+    libclang-common-3.8-dev \
+    libllvm3.8 \
+    libobjc4 \
+    libgc1c2 \
   && wget -O libssl1.0.0.deb http://ftp.debian.org/debian/pool/main/o/openssl/libssl1.0.0_1.0.1t-1+deb8u8_amd64.deb \
   && dpkg -i libssl1.0.0.deb \
   && rm libssl1.0.0.deb \
-  && RSTUDIO_LATEST=$(wget --no-check-certificate -qO- https://s3.amazonaws.com/rstudio-server/current.ver) \
-  && [ -z "$RSTUDIO_VERSION" ] && RSTUDIO_VERSION=$RSTUDIO_LATEST || true \
-  && wget -q http://download2.rstudio.org/rstudio-server-${RSTUDIO_VERSION}-amd64.deb \
-  && dpkg -i rstudio-server-${RSTUDIO_VERSION}-amd64.deb \
+  && if [ -z "$RSTUDIO_VERSION" ]; then RSTUDIO_URL="https://www.rstudio.org/download/latest/stable/server/debian9_64/rstudio-server-latest-amd64.deb"; else RSTUDIO_URL="http://download2.rstudio.org/rstudio-server-${RSTUDIO_VERSION}-amd64.deb"; fi \
+  && wget -q $RSTUDIO_URL \
+  && dpkg -i rstudio-server-*-amd64.deb \
   && rm rstudio-server-*-amd64.deb \
   ## Symlink pandoc & standard pandoc templates for use system-wide
   && ln -s /usr/lib/rstudio-server/bin/pandoc/pandoc /usr/local/bin \
   && ln -s /usr/lib/rstudio-server/bin/pandoc/pandoc-citeproc /usr/local/bin \
-  && git clone https://github.com/jgm/pandoc-templates \
+  && git clone --recursive --branch ${PANDOC_TEMPLATES_VERSION} https://github.com/jgm/pandoc-templates \
   && mkdir -p /opt/pandoc/templates \
   && cp -r pandoc-templates*/* /opt/pandoc/templates && rm -rf pandoc-templates* \
   && mkdir /root/.pandoc && ln -s /opt/pandoc/templates /root/.pandoc/templates \
@@ -82,8 +93,7 @@ RUN apt-get update \
           > /home/rstudio/.rstudio/monitored/user-settings/user-settings \
   && chown -R rstudio:rstudio /home/rstudio/.rstudio
 
-## User configuration script
-COPY userconf.sh /etc/cont-init.d/01-userconf
+COPY userconf.sh /etc/cont-init.d/userconf
 
 ## running with "-e ADD=shiny" adds shiny server
 COPY add_shiny.sh /etc/cont-init.d/add
@@ -93,7 +103,6 @@ COPY pam-helper.sh /usr/lib/rstudio-server/bin/pam-helper
 EXPOSE 8787
 
 ## automatically link a shared volume for kitematic users
-#VOLUME /home/rstudio/kitematic
+VOLUME /home/rstudio/kitematic
 
 CMD ["/init"]
-