Add "frozen_string_literal: false" for all files (#26561).

This will be changed to true in the future.


git-svn-id: http://svn.redmine.org/redmine/trunk@17947 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/20150510083747_change_documents_title_limit.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: false
+
 class ChangeDocumentsTitleLimit < ActiveRecord::Migration[4.2]
   def self.up
     change_column :documents, :title, :string, :limit => nil, :default => '', :null => false