Add documentation for the Sidekiq MemoryKiller
Remove unfinished file with the wrong name
Add link to 'operations' README
Merge branch 'doc/sidekiq_memory_killer' into 'master'

Add documentation for the Sidekiq MemoryKiller

We already merged the code, and we are already using it on gitlab.com. This MR adds documentation.

See merge request !1325
add kerberos to Gemfile
Merge branch 'update_gemfile_with_kerberos' into 'master'

Add kerberos to gemfile

See merge request !1330
Move development information to the GitLab Development Kit.
Merge branch 'dev-docs-in-gdk' into 'master'

Dev docs in gdk

Also see https://gitlab.com/gitlab-org/gitlab-development-kit/merge_requests/31

See merge request !1331
Merge branch 'master' of github.com:gitlabhq/gitlabhq