Rails4: replace hard-coded html with class at IssuesHelperTest

See r12784 comment.

git-svn-id: http://svn.redmine.org/redmine/trunk@12872 e93f8b46-1217-0410-a6f0-8f06a7374b81
add "jruby-20mode" and "jruby-21mode" to .travis.yml

git-svn-id: http://svn.redmine.org/redmine/trunk@12873 e93f8b46-1217-0410-a6f0-8f06a7374b81