Merge branch 'master' of https://gitlab.com/gitlab-org/gitlab-ce into fix/private-references

CHANGELOG

CONTRIBUTING.md

GITLAB_WORKHORSE_VERSION

Gemfile

app/assets/javascripts/issue.js.coffee

app/assets/javascripts/merge_request.js.coffee

app/assets/javascripts/notes.js.coffee

app/assets/stylesheets/framework/lists.scss

app/assets/stylesheets/framework/variables.scss

app/assets/stylesheets/pages/issues.scss

app/controllers/admin/abuse_reports_controller.rb

app/controllers/admin/application_settings_controller.rb

app/helpers/application_helper.rb

app/helpers/notes_helper.rb

app/models/abuse_report.rb

app/models/hooks/web_hook.rb

app/models/project_services/hipchat_service.rb

app/models/project_services/irker_service.rb

app/services/system_hooks_service.rb

app/views/admin/application_settings/_form.html.haml