Merge branch '394_user_tags' into 'develop'

[#394] User tags

Closes #394

See merge request pleroma/pleroma!508

priv/repo/migrations/20181206125616_add_tags_to_users.exs

@@ -0,0 +1,11 @@
+defmodule Pleroma.Repo.Migrations.AddTagsToUsers do
+  use Ecto.Migration
+
+  def change do
+    alter table(:users) do
+      add :tags, {:array, :string}
+    end
+
+    create index(:users, [:tags], using: :gin)
+  end
+end