Add address input and refactor federation stuff

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/repo/migrations/20190729125532_add-url-to-addresses.exs

@@ -0,0 +1,9 @@
+defmodule :"Elixir.Mobilizon.Repo.Migrations.Add-url-to-addresses" do
+  use Ecto.Migration
+
+  def change do
+    alter table(:addresses) do
+      add(:url, :string, null: false)
+    end
+  end
+end