Upgrade Rails to 3.2.10 for security fix

http://weblog.rubyonrails.org/2013/1/2/Rails-3-2-10--3-1-9--and-3-0-18-have-been-released/
Merge pull request #158 from doitian/rails-upgrade-to-3.2.10

Upgrade Rails to 3.2.10 for security fix