* master: (238 commits)
  Version 6.5.1
  Fix selectbox when submit MR from fork to origin
  Fix HELP layout
  No need for code tag here.
  Spelling mistake and add links.
  Warn against RVM.
  Remove GitHub mention because we also have a GitLab issue tracker now.
  Replace 6.0-to-6.4.md with 6.0-to-6.5.md
  Add public assets to gitignore
  Version 6.5.0
  Use 6-5 branch in installation docs
  Remove deprecated twitter handle.
  Further explain userPrincipalName settings
  Update from 6.4 to 6.5 guide
  Explain how to use AD userPrincipalName for logins
  More entries to CHANGELOG. Version to rc1
  Rephrase LDAP check script output
  add O'Reilly sponsorship in CHANGELOG
  Fix select2 css for drop above style
  Rename "Website url" labels to "Website"
  ...

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

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

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

Remove deprecated finders

Warn Against Version Managers

Ugly Reference

This prevents it displaying as < code > on https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/install/installation.md

Remove github specific mention of issue tracker

Replace 6.0-to-6.4.md with 6.0-to-6.5.md

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

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

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

Remove Old Twitter

Updated gitlab.yaml.example's issue_closing_pattern to single quotes

Explain how to use userPrincipalName as the username with AD

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

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

 Added support for Go's repository retrieval.

Rephrase LDAP check script output

The previous phrasing lead some people to believe that there is a limit
on the number of LDAP users that can sign in to a GitLab instance. That
is not the case; the limit in the check script only applies to the
diagnostic information result set, so that running `rake gitlab:check`
does not output thousands of LDAP users.

Changelog Base64

Add O'Reilly sponsorship in CHANGELOG

Explain where the memory recommendation comes from

The 250MB repo limit is caused by the git command line.

Also see MR !422

Rename "Website url" labels to "Website"

Encouragement during install

Fix select2 css for drop above style less than a minute ago

Fix 500 error on project issues and merge requests pages

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