Yajl backend discovery fails in ActiveSupport::JSON

Hi,

In "activesupport/lib/active_support/json/backends/yajl.rb", there is an attempt to use Yajl as a json backend if 'yajl-ruby' gem is available.

This attempt fails because the require statement is erroneous:

require 'yajl-ruby' unless defined?(Yajl)

Should be:

require 'yajl' unless defined?(Yajl)

So Yajl isn't used as default decoding backend when gem is available.

Besides, I find a bit confusing that the gem is referenced as 'yajl-ruby' but the require statement is 'yajl'.

This could be fixed easily in rails 2.3.9 (see attached patch).

Thanks.