2.2-stable: backout r11355 (back to Rails 3.2.11)

jruby-1.6.7 tests fail on CI server.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.2-stable@11356 e93f8b46-1217-0410-a6f0-8f06a7374b81