Gemfile: update Rails 3.2.18

git-svn-id: http://svn.redmine.org/redmine/trunk@13130 e93f8b46-1217-0410-a6f0-8f06a7374b81
remove unneeded trailing ';' from test/functional/repositories_git_controller_test.rb

git-svn-id: http://svn.redmine.org/redmine/trunk@13131 e93f8b46-1217-0410-a6f0-8f06a7374b81
remove unneeded trailing ';' from lib/redmine/export/pdf.rb

git-svn-id: http://svn.redmine.org/redmine/trunk@13132 e93f8b46-1217-0410-a6f0-8f06a7374b81