Upgrade the Rails patch version.

This is to address several security issues. See
http://weblog.rubyonrails.org/2013/1/8/Rails-3-2-11-3-1-10-3-0-19-and-2-3-15-have-been-released/
for more details. The app was at 3.2.2 and I upgraded it to 3.2.11.