Upgrade to Rails 2.3.17
Upgrade to rack 1.1.6
Upgrade json_pure to 1.5.5
Fix failing test due to new HTML-escaping rules

A change in Rails causes single quotes to now be escaped by `h`.
Merge branch 'cve/1.2rc/rails-2.3.17' into 1.2rc

* cve/1.2rc/rails-2.3.17:
  Fix failing test due to new HTML-escaping rules
  Upgrade json_pure to 1.5.5
  Upgrade to rack 1.1.6
  Upgrade to Rails 2.3.17
Update VERSION for 1.2.22