Update of the packages installation and container initialisation

I updated the packages installed in order to:

- remove some unecessary packages related mainly to Rails
- add packages relation to python 3 and Django

I updated the container initialisation that seems to fit the current
practice with other container initialisation process.

One thing to mention. Supervisor can't work with Python 3. Anthony
suggested to install Python 2 just to make Supervisor happy and run
Gunicorn/Python 3 as such.
Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/Dockerfile

 FROM allgo/base-debian
 
-# install system packages + bower
+# install system packages
 RUN apt-getq install mariadb-client libmariadb-client-lgpl-dev-compat	\
 	redis-server curl imagemagick git ca-certificates		\
 	gcc g++ make libc6-dev file libffi-dev libgdbm-dev libgmp-dev	\
 	libncurses5-dev libncursesw5-dev libreadline6-dev libssl-dev	\
 	libyaml-dev openssl procps systemtap-sdt-dev zlib1g-dev		\
-	nodejs npm supervisor nginx-light zip				\
-  python3 python3-pip \
-	&& ln -s /usr/bin/nodejs /usr/local/bin/node			\
-	&& npm install -g bower
+	supervisor nginx-light zip				\
+  python3 python3-pip python3-django
 
 COPY	. /opt/allgo
 COPY init /dk/container_init
-# RUN	sh /opt/allgo/setup.sh
+RUN	sh /opt/allgo/setup/dk/container_init
 
-USER	allgo
 WORKDIR /opt/allgo
 LABEL   dk.migrate_always=1