Add a cloud_platform 'profile' addon

* When installed, it pulls the addons required for Odoo to run on the
  Cloud Platform.
* It provides a method to configure Odoo at the installation.
* It checks if the environment variables are correct according the the
  'server environment'
* And add documentation

cloud_platform/songs.py

@@ -0,0 +1,4 @@
+# -*- coding: utf-8 -*-
+
+def install_exoscale(ctx):
+    ctx.env['cloud.platform'].install_exoscale()