Add send_git_diff helper

.gitlab-ci.yml

CHANGELOG

CONTRIBUTING.md

GITLAB_WORKHORSE_VERSION

Gemfile

Gemfile.lock

Rakefile

app/assets/javascripts/LabelManager.js.coffee

app/assets/javascripts/application.js.coffee

app/assets/javascripts/awards_handler.coffee

app/assets/javascripts/dispatcher.js.coffee

app/assets/javascripts/due_date_select.js.coffee

app/assets/javascripts/lib/emoji_aliases.js.coffee.erb

app/assets/javascripts/milestone_select.js.coffee

app/assets/javascripts/notes.js.coffee

app/assets/javascripts/shortcuts_issuable.coffee

app/assets/javascripts/users_select.js.coffee

app/assets/stylesheets/framework/blocks.scss

app/assets/stylesheets/framework/dropdowns.scss

app/assets/stylesheets/framework/gitlab-theme.scss