Merge branch 'feature/767-multiple-use-invite-token' into 'develop'

Feature/767 multiple use invite token

See merge request pleroma/pleroma!1032

priv/repo/migrations/20190404050946_add_fields_to_user_invite_tokens.exs

@@ -0,0 +1,12 @@
+defmodule Pleroma.Repo.Migrations.AddFieldsToUserInviteTokens do
+  use Ecto.Migration
+
+  def change do
+    alter table(:user_invite_tokens) do
+      add(:expires_at, :date)
+      add(:uses, :integer, default: 0)
+      add(:max_use, :integer)
+      add(:invite_type, :string, default: "one_time")
+    end
+  end
+end