Upgrade to Rails 3.0.20
Merge pull request #11 from frankshearar/uprev-to-3.0.20

Rails 3.0.19 has a security vulnerability
Update JSON for CVE-2013-0269.
Merge pull request #12 from cstorey/update-json-for-CVE-2013-0269

 Denial of Service and Unsafe Object Creation Vulnerability in JSON [CVE-2013-0269]
Updated from master