Add Dockerfile for application and documentation

This commit adds a `Dockerfile` to the root of the project, accompanied
by a `docker-compose.yml.example` for simplified deployment. The
`Dockerfile` is agnostic to whether it will be the webserver, the
consumer, or if it is run for a one-off command (i.e. creation of a
superuser, migration of the database, document export, ...).

The containers entrypoint is the `scripts/docker-entrypoint.sh` script.
This script verifies that the required permissions are set, remaps the
default users and/or groups id if required and installs additional
languages if the user wishes to.

After initialization, it analyzes the command the user supplied:

  - If the command starts with a slash, it is expected that the user
    wants to execute a binary file and the command will be executed
    without further intervention. (Using `exec` to effectively replace
    the started shell-script and not have any reaping-issues.)

  - If the command does not start with a slash, the command will be
    passed directly to the `manage.py` script without further
    modification. (Again using `exec`.)

The default command is set to `--help`.

If the user wants to execute a command that is not meant for `manage.py`
but doesn't start with a slash, the Docker `--entrypoint` parameter can
be used to circumvent the mechanics of `docker-entrypoint.sh`.

Further information can be found in `docs/setup.rst` and in
`docs/migrating.rst`.

For additional convenience, a `Dockerfile` has been added to the `docs/`
directory which allows for easy building and serving of the
documentation. This is documented in `docs/requirements.rst`.

src/documents/management/commands/loaddata_stdin.py

@@ -0,0 +1,23 @@
+"""
+Source:
+    https://gist.github.com/bmispelon/ad5a2c333443b3a1d051
+
+License:
+    MIT
+    Copyright (c) 2016 Baptiste Mispelon
+"""
+import sys
+
+from django.core.management.commands.loaddata import Command as LoadDataCommand
+
+
+class Command(LoadDataCommand):
+    def parse_name(self, fixture_name):
+        self.compression_formats['stdin'] = (lambda x,y: sys.stdin, None)
+        if fixture_name == '-':
+            return '-', 'json', 'stdin'
+
+    def find_fixtures(self, fixture_label):
+        if fixture_label == '-':
+            return [('-', None, '-')]
+        return super(Command, self).find_fixtures(fixture_label)