Add GAP-Jupyter demo

_activities/2016-08-03-gap-docker-jupyter.md

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+---
+layout: activity
+title: "Jupyter-GAP now available as Docker image"
+author: Markus Pfeiffer
+type: software
+date: 2016/08/03
+---
+
+Yesterday Alexander Konovalov and Markus Pfeiffer created a [Docker](https://docker.com) image containing
+[GAP](http://www.gap-system.org), and an early version of the [GAP-Jupyter](https://github.com/gap-packages/jupyter-gap)
+interface for ease of access. It is available from [dockerhub](https://hub.docker.com/r/gapsystem/gap-docker-jupyter/).
+
+If you have docker already installed on your system, it should be fairly easy to get yourself up and running with the
+following commands
+
+```
+# docker pull gapsystem/gap-docker-jupyter
+# docker run -t -i -p 8888:8888 --net="host" gapsystem/gap-docker-jupyter
+# firefox http://localhost:8888
+```
+
+The above commands will start a docker container with jupyter and a complete GAP installation ready to use. Here's an
+example of use:
+
+![Jupyter/GAP/Docker](public/img/gap-docker-jupyter-demo.png){: .center-image }
+
+Note that this is an early version, and the roadmap for the next release is already quite clearly laid out. Contributions
+to GAP-Jupyter and the GAP system itself are very welcome. Please submit them through the appropriate trackers on github.