Update to Rails 3.2.12

This version of Rails contains security fixes for the following
vulnerabilities:

* [CVE-2013-0276] Circumvention of attr_protected
* [CVE-2013-0277] Serialized Attributes YAML Vulnerability with
  Rails 2.3 and 3.0
Update to Chef 11.4.0

This version is compatible with the changes in the recent 1.7.7 release
of the JSON gem that fix:

* [CVE-2013-0269] Denial of Service and Unsafe Object Creation
  Vulnerability in JSON
Merge branch 'security-updates'