added Dockerfile for /ext/eddy4R

Dockerfile

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+# start with the ropensci image including debian:testing, r-base, rocker/rstudio, rocker/hadleyverse
+# https://hub.docker.com/r/rocker/ropensci/
+FROM rocker/ropensci:latest
+
+# maintainer handle
+MAINTAINER "Stefan Metzger" [email protected]
+
+# install OS-side dependencies
+
+	# update the list of available packages and their versions
+    RUN apt-get update
+
+  # install dependencies
+    RUN apt-get install -y \
+      # EBImage
+        fftw3 \
+        fftw3-dev \
+        libjpeg-dev \
+        libtiff-dev \
+      # REddyProc
+        libudunits2-0 \
+        libudunits2-dev \
+        libnetcdf-dev \
+        udunits-bin
+
+# install the eddy4R packages via web-hosted installation script
+RUN R -e 'source("https://www.dropbox.com/s/b9kosg2jr34w3lk/flow.inst.R?dl=1")'
+
+# provide read and write access for default R library location to Rstudio users 
+RUN chmod -R 777 /usr/local/lib/R/site-library