BSON::OrderedHash should allow options extraction using Array#extract_options!

There's a commonly used approach to extract options from method arguments using Array#extract_options!

Example:

require 'active_support'

def foo(*args)

  args.extract_options!

end

foo(1, 1, { :some => 'hash' })  # => { :some => 'hash' } 

However when using `bson` gem inside a project the example above returns {}.

ActiveSupport requires BSON::OrderedHash to implement method #extractable_options? to support options extraction. See https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/array/extract_options.rb#L7

Expected result: It should still be possible to use Array#extract_options! if a gem has dependency on `bson`