Give Ruby 1.9 OpenStruct [] and []= like in Ruby 2.0

gistfile1.rb

options = OpenStruct.new({a: 1, b: 2})

# make options[] work in 1.9 like 2.0
unless options.respond_to?(:[])
  options.extend(Forwardable)
  options.def_delegators :@table, :[], :[]=
end

# now I can do
options[:a]

# instead of having to do
options.send(:a)

# but can still do
options.a
options.b