Add textual descriptions to each image

config/plugins/interactive_environments/ipython/config/allowed_images.txt.sample

@@ -4,4 +4,4 @@
 # for your users to run. E.g. maybe you need a geosciences flavour,
 # you can create the image based on our default image and add the
 # appropriate `apt-get/pip install` statements.
-bgruening/docker-ipython-notebook:15.10.1
+bgruening/docker-ipython-notebook:15.10.1	IPython notebooks allow for interactive analysis of datasets with the Python programming language. The default image comes complete with scipy, numpy, pandas, etc.

config/plugins/interactive_environments/jupyter/config/allowed_images.txt.sample

@@ -4,4 +4,4 @@
 # for your users to run. E.g. maybe you need a geosciences flavour,
 # you can create the image based on our default image and add the
 # appropriate `apt-get/pip install` statements.
-bgruening/docker-jupyter-notebook:16.01
+bgruening/docker-jupyter-notebook:16.01	The Jupyter notebook is the next iteration of IPython, allowing analysis in many different languages. This image features the Python, R, Julia, Haskell, Bash kernels and many scientific analysis stacks for each.

config/plugins/interactive_environments/rstudio/config/allowed_images.txt.sample

@@ -4,4 +4,4 @@
 # for your users to run. E.g. maybe you need a geosciences flavour,
 # you can create the image based on our default image and add the
 # appropriate `apt-get/pip install` statements.
-erasche/docker-rstudio-notebook:15.10
+erasche/docker-rstudio-notebook:15.10	If you've ever done R analysis, you probably used RStudio. This familiar R analysis software suite will let you explore your datasets in depth. Comes with ggplot2, RODBC, maps, shinyapps, knitr, LaTeX, bioconductor, cummeRbund, and many more pre-installed packages.