Merge pull request #5436 from Seed-Of-Hate/master

Fix for issue #5431
Restore sidekiq rake tasks
Report application status through init exit code
Merge branch 'fix_sidekiq_rake' of /home/git/repositories/gitlab/gitlabhq
Update installation.md

Updated instructions to include proper stable. Otherwise they fail due to Rack extensions required below.
Reset button/link on the reset password page. Fixes #5418
Merge pull request #5448 from flewid/patch-1

Update installation.md
Merge pull request #5453 from perryfaro/password-page

Reset buttons/links on the reset password page
Better font size for projects list on dashboard
rounded avatars
Reduce font-size for event-title
Minor restyle for event filter
Add hero-unit to /help
Use same color for event body
Universal update guide for patch versions
master is on 6.3.0.pre now
Refer to disclosure policy in CONTRIBUTING.md
Merge branch 'init_exit_status' of /home/git/repositories/gitlab/gitlabhq
Merge branch 'security_vulnerabilities' of /home/git/repositories/gitlab/gitlabhq
Merge branch '51-to-60-update' of /home/git/repositories/gitlab/gitlabhq