Add GraphQL support to handle FeedTokens

Closes #88

Automatically create tokens for new users and actors

Closes #89

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

priv/repo/migrations/20190307133518_feed_token_table.exs

@@ -2,8 +2,8 @@ defmodule Mobilizon.Repo.Migrations.FeedTokenTable do
   use Ecto.Migration
 
   def change do
-    create table(:feed_token, primary_key: false) do
-      add(:token, :string, primary_key: true)
+    create table(:feed_tokens, primary_key: false) do
+      add(:token, Ecto.UUID.type(), primary_key: true)
       add(:actor_id, references(:actors, on_delete: :delete_all), null: true)
       add(:user_id, references(:users, on_delete: :delete_all), null: false)