Merge branch 'ci-and-ce-sitting-in-a-tree-k-i-s-s-i-n-g' of gitlab.com:gitlab-org/gitlab-ce into ci-and-ce-sitting-in-a-tree-k-i-s-s-i-n-g

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Merge branch 'ci-and-ce-sitting-in-a-tree-k-i-s-s-i-n-g' of gitlab.com:gitlab-org/gitlab-ce into ci-and-ce-sitting-in-a-tree-k-i-s-s-i-n-g

Fix UI bugs with discussions
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1265

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Do not let NGINX buffer Git HTTP requests

Before this change NGINX would convert a chunked HTTP POST (e.g.
git push) into a HTTP 1.0 single large POST. This creates an
unnecessary delay, and it creates unnecessary memory pressure on
gitlab-git-http-server.

For the response ('proxy_buffering') I am less sure that NGINX 's
buffering behavior is harmful, but it still makes more sense to me
not to interfere with gitlab-git-http-server (and the Golang net/http
server).

See merge request !1256

Add meta tag for referrer

https://gitlab.zendesk.com/agent/tickets/7054

Added a meta referrer tag, so that only the origin is sent to third party sites, instead of the entire URL, thus avoiding the leak of sensitive information like password reset tokens.

/cc @DouweM

See merge request !1263

Global labels

https://dev.gitlab.org/gitlab/gitlabhq/issues/2353

See merge request !1240

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