Add a script to output the domains data as a list

This will be useful for putting into a database (it would be hard to
do so in its current, linked format).

domains.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import os
+import yaml
+from app.utils import AgreementInfo
+
+_dir_path = os.path.dirname(os.path.realpath(__file__))
+
+
+with open('{}/app/domains.yml'.format(_dir_path)) as source:
+
+    data = yaml.load(source)
+
+    for domain, details in data.items():
+        if isinstance(details, dict):
+            # We’re looking at the canonical domain
+            data[domain]['domains'] = [domain]
+
+    for domain, details in data.items():
+        if isinstance(details, str):
+            # This is an alias, let’s add it to the canonical domain
+            data[AgreementInfo(domain).canonical_domain]['domains'].append(domain)
+
+    out_data = [
+        details for domain, details in data.items()
+        if isinstance(details, dict)
+    ]
+
+    print(yaml.dump(out_data))  # noqa