2.6-stable: Gemfile: update Rails to 3.2.21

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13612 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13555 (#13608).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13627 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13556 (#13673).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13628 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13557 (#17744).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13629 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13562 (#18269).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13630 e93f8b46-1217-0410-a6f0-8f06a7374b81
Backported r13560 and r13569 (#18280).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13631 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13592, r13594, r13599 (#18349).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13632 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13477 (#18051).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13633 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13593 (#17705).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13634 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13486 to r13489 and r13492 (#8817).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13635 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13610 (#18357).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13636 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13625 (#18410).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13637 e93f8b46-1217-0410-a6f0-8f06a7374b81
2.6-stable: fix syntax error on Ruby 1.8.7 (#18280)

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13640 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13638 (#18060).

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13642 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merge remote-tracking branch 'upstream/2.6-stable' into ro-2-6
bundle update