Improve, restructure documentation and add screenshot

docs/debian_installer/setup_debian_1_install_postgres.sh

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+# update apt-get
+echo "Update apt-get..."
+sudo apt-get update
+# upgrade all packages
+echo "Upgrade packages..."
+sudo apt-get upgrade
+
+#install postgres
+if [ ! -f /etc/apt/sources.list.d/pgdg.list ]
+then
+  echo "Add Postgres sources..."
+  cd /etc/apt/sources.list.d
+  sudo touch pgdg.list
+  sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main" > pgdg.list'
+  sudo wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
+  sudo apt-get update
+  echo "Done"
+else
+  echo "Postgres sources already added"
+fi
+
+sudo apt-get -y --force-yes install postgresql-9.5
+
+# drop postgres access control
+if [ -f /etc/postgresql/9.5/main/pg_hba.conf ]
+then
+  if ! sudo -u postgres grep -q CodeOcean /etc/postgresql/9.5/main/pg_hba.conf
+  then
+    echo "Drop Postgres access control..."
+    sudo -u postgres sh -c 'cat >/etc/postgresql/9.5/main/pg_hba.conf <<EOF
+#CodeOcean: drop access control
+local all all trust
+host  all all 127.0.0.1/32 trust
+host  all all ::1/128 trust
+EOF'
+    echo "Done"
+    echo "Restart Postgres..."
+    echo sudo service postgresql restart
+    echo "Done"
+  else
+    echo "Postgres access control already dropped"
+  fi
+else
+    echo "Postgres installation failed"
+fi
+
+# create development database
+# TODO: extract databasename to variable
+if ! (sudo -u postgres psql -l | grep -q codeocean-development)
+then
+  echo "Create database codeocean-development..."
+  sudo -u postgres createdb codeocean-development || true
+  sudo -u postgres psql -d codeocean-development -U postgres -c "CREATE USER root;"
+  sudo -u postgres psql -d codeocean-development -U postgres -c 'GRANT ALL PRIVILEGES ON DATABASE "codeocean-development" to root';
+  sudo -u postgres psql -d codeocean-development -U postgres -c "CREATE USER debian;"
+  sudo -u postgres psql -d codeocean-development -U postgres -c 'GRANT ALL PRIVILEGES ON DATABASE "codeocean-development" to debian';
+  sudo -u postgres psql -d codeocean-development -U postgres -c "CREATE USER codeocean;"
+  sudo -u postgres psql -d codeocean-development -U postgres -c 'GRANT ALL PRIVILEGES ON DATABASE "codeocean-development" to codeocean';
+  sudo -u postgres psql -d codeocean-development -U postgres -c 'ALTER DATABASE "codeocean-development" OWNER TO codeocean';
+  sudo -u postgres psql -d codeocean-development -U postgres -c 'ALTER USER "codeocean" CREATEDB';
+  echo "Done"
+else
+  echo "Database codeocean-development already exists"
+fi
+
+# TODO: create test database
+
+
+