Merge branch 'gs-master' into prevent-local-only-federation

Conflicts:
	db/schema.rb

db/migrate/20171201000000_change_account_id_nonnullable_in_lists.rb

@@ -0,0 +1,7 @@
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class ChangeAccountIdNonnullableInLists < ActiveRecord::Migration[5.1]
+  def change
+    change_column_null :lists, :account_id, false
+  end
+end

db/migrate/20171212195226_remove_duplicate_indexes_in_lists.rb

@@ -0,0 +1,6 @@
+class RemoveDuplicateIndexesInLists < ActiveRecord::Migration[5.1]
+  def change
+    remove_index :list_accounts, name: "index_list_accounts_on_account_id"
+    remove_index :list_accounts, name: "index_list_accounts_on_list_id"
+  end
+end