Assign `@user` to the GitLab User object during LDAP login

Prior, we assigned it to the `Gitlab::LDAP::User` object which delegated
_some_ methods to the internal `gl_user` object, but not everything,
which caused a 500 error when a view expected it to behave the same, for
example by responding to `avatar_url`.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/229

See merge request !146

Prior, we assigned it to the `Gitlab::LDAP::User` object which delegated
_some_ methods to the internal `gl_user` object, but not everything,
which caused a 500 error when a view expected it to behave the same, for
example by responding to `avatar_url`.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/229

Show warning when mirror repository default branch could not be
updated because it has diverged from upstream.

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/223

See merge request !138

Fix updating of branches in mirrored repository

Reported in https://gitlab.com/gitlab-org/gitlab-ee/issues/190#note_3373621

See merge request !136

Don't redirect away from Mirror Repository settings when repo is empty

Fixes #217

See merge request !135

Elastic indexer performance improvements

https://gitlab.com/gitlab-org/gitlab-ee/issues/220

See merge request !140

Use correct settings for elasticsearch in omnibus-gitlab.

Fixes #227 

See merge request !144

Gitlab Geo: Authentication

Initial internal API for discovery and authentication for the gitlab-org/gitlab-ee#76

See merge request !112

Add administration section to git-annex doc.



See merge request !132

[ci skip]

CE upstream



See merge request !131

Show warning when mirror repository default branch could not be updated because it has diverged from upstream.

Remove '(EE-only)' from Elasticsearch list item



See merge request !137

[ci skip]

- Rearrange sections
- Limit lines to 80 chars
- Fix typos, grammar, etc.

[ci skip]

[ci skip]