Merge branch 'push-release-doc' into 'master'

Push release doc

doc/release/README.md

-+ [Monthly](monthly.md)
-+ [Security](security.md)
+GitLab has the following updates:
+
++ [Monthly release](monthly.md), every month on the 22nd.
++ [Patch release](patch.md), if there are serious regressions.
++ [Security](security.md), for security problems.
++ [Master](master.md), update process for the master branch.

doc/release/master.md

+# How to push GitLab CE master branch to all remotes.
+
+Distribution to other repo's is done by the lead developer if there is no rush.
+This happens a few times per workday on average.
+If a GitLab B.V. person wants to do it here are the instructions.
+
+## Add this to `.bashrc` or [your dotfiles](https://github.com/dosire/dotfiles/commit/52803ce3ac60d57632164b7713ff0041e86fa26c)
+
+```bash
+gpa ()
+{
+  git push origin ${1:-master} && git push gh ${1:-master} && git push gl ${1:-master}
+}
+```
+
+## Then add remotes to your local repo
+
+```bash
+cd my-gitlab-ce-repo
+
+git remote add origin git@dev.gitlab.org:gitlab/gitlabhq.git
+git remote add gh git@github.com:gitlabhq/gitlabhq.git
+git remote add gl git@gitlab.com:gitlab-org/gitlab-ce.git
+```
+
+## Push to all remotes
+
+```bash
+gpa
+```
+