Add binder files

Dockerfile

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+# This is the Dockerfile to run Gammapy on Binder.
+#
+
+FROM continuumio/miniconda3:4.5.4
+MAINTAINER Gammapy developers <gammapy@googlegroups.com>
+
+# compilers
+RUN apt-get update && apt-get install -y build-essential
+RUN pip install --upgrade pip
+
+# install dependencies - including the stable version of Gammapy
+COPY binder.py tmp/
+RUN curl -o tmp/environment.yml https://gammapy.org/download/install/gammapy-0.8-environment.yml
+
+WORKDIR tmp/
+RUN conda update conda
+RUN conda install -q -y pyyaml
+RUN python binder.py
+
+# add gammapy user running the jupyter notebook process
+ENV NB_USER gammapy
+ENV NB_UID 1000
+ENV HOME /home/${NB_USER}
+
+RUN adduser --disabled-password \
+    --gecos "Default user" \
+    --uid ${NB_UID} \
+    ${NB_USER}
+
+# download tutorials and datasets
+RUN gammapy download notebooks --out=${HOME}/gammapy-tutorials --release=0.8
+RUN gammapy download datasets --out=${HOME}/gammapy-datasets --release=0.8
+
+# setting ownerships
+USER root
+RUN chown -R gammapy:gammapy ${HOME}
+
+# start JupyterLab server in tutorials dir
+USER ${NB_USER}
+WORKDIR ${HOME}/gammapy-tutorials/notebooks-0.8
+
+# env vars used in tutorials
+ENV GAMMAPY_DATA ${HOME}/gammapy-datasets

binder.py

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+"""Install code on Binder.
+
+This script is executed from Dockerfile configuration file
+It installs software dependencies declared in environment.yml
+in the docker container built for the Binder service.
+"""
+import yaml
+import conda.cli
+from pip._internal import main as pip_main
+
+with open("environment.yml") as stream:
+    content = yaml.load(stream)
+
+for chan in content['channels']:
+    print("RUN conda config --add channels {}".format(chan))
+    conda.cli.main('conda', 'config',  '--add', 'channels', chan)
+
+for pack in content['dependencies']:
+    if isinstance(pack, str):
+        print("RUN conda install -q -y {}".format(pack))
+        conda.cli.main('conda', 'install',  '-y', '-q', pack)
+    else:
+        print("RUN pip install {}".format(pack['pip'][0]))
+        pip_main(["install", pack['pip'][0]])