* ext/json: merge JSON 1.8.1.
  https://github.com/nurse/json/compare/002ac2771ce32776b32ccd2d06e5604de6c36dcd...e09ffc0d7da25d0393873936c118c188c78dbac3
* Remove Rubinius exception since transcoding should be working now.
* Fix https://github.com/flori/json/issues/162 reported by Marc-Andre
  Lafortune <github_rocks@marc-andre.ca>. Thanks!
* Applied patches by Yui NARUSE <naruse@airemix.jp> to suppress
  warning with -Wchar-subscripts and better validate UTF-8 strings.
* Applied patch by ginriki@github to remove unnecessary if.
* Add load/dump interface to JSON::GenericObject to make
  serialize :some_attribute, JSON::GenericObject
  work in Rails active models for convenient
  SomeModel#some_attribute.foo.bar access to serialised JSON data.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43731 b2dd03c8-39d4-4d8f-98ff-823fe69b080e