Multiline blockquotes seem to be broken in the GitLab web site's GFM documentation: http://i.imgur.com/agTjiLc.png
http://docs.gitlab.com/ce/markdown/markdown.html#multiline-b...
http://docs.gitlab.com/ce/markdown/markdown.html#multiline-b...
I've created a Merge Request to add a note to the top of the document encouraging people to view it within GitLab: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5440
You can check out the Multiline Blockquote example in all its glory here: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/mark...
That page renders correctly if viewed through the repository browser (which apparently always renders Markdown as GFM): https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc//mar...