Temporary fix for #4305: Cant preview attached png images on notes; attachment.secure_url returns an url which is accessible
Merge remote-tracking branch 'upstream/master' into fix-4305
Commit message textareas have 72 char mark line.
start writing deploy key to multiple projects
Expose archive status of projects in API

That way clients like Gitlab CI can decide to show or hide projects
based on that information
Add info about exposed Project::archived to API docs
start to make the monthly release doc a step by step guide
Satellites access fix
improve headers, add details
add ee, ci and patch release
Merge branch 'master' into monthly-revision

Conflicts:
	doc/release/monthly.md
remove redundancy, remove really good joke, add step to release
add loop to deploy key to multiple projects
monthly doc tweet template, small changes
Added email threading for update emails on issues and merge requests (if the mail client support the References: mail header)
Now using correct ids as reference if we are informing about a new note.
Added some tests.
Fix css rules conflict between .dark & a.dark classes
Link to the installation doc so people viewing on other locations can click the link.
Merge branch 'link-to-installation-doc' into 'master'

Link to installation doc