if RUBY_VERSION < '1.9'
  # hash.key
  class Hash
    def key(x)
      index(x)
    end
  end
  class String
    def force_to_bin
      self
    end
  end
else
  class String
    def force_to_bin
      force_encoding('us-ascii')
    end
  end
end
require 'forwardable'
require 'gepub/version'
require 'gepub/xml_util'
require 'gepub/meta'
require 'gepub/datemeta'
require 'gepub/metadata'
require 'gepub/manifest'
require 'gepub/spine'
require 'gepub/bindings'
require 'gepub/package'
require 'gepub/item'
require 'gepub/book'
require 'gepub/builder_mixin'
require 'gepub/resource_builder'
require 'gepub/builder'