Fixes pages domains abilities and group page address

The `master` can now access the pages configuration, modify domains and add certificates, but can't remove the pages.

The second bug that is fixed is the group page address. The group page project name needs to be in lowercase.

/cc @DouweM @rymai 

See merge request !195

Fix markdown link



See merge request !203

[ci skip]

Don't index unnecessary data into elastic

Fixes https://dev.gitlab.org/gitlab/gitlab-ee/issues/347

See merge request !198

[ES indexer] Stabilze indexer when serialized data is corrupted

https://gitlab.com/gitlab-com/operations/issues/56#note_3824850

See merge request !196

Include elasticsearch service in global context

/cc @vsizov 

See merge request !197

CE upstream

```
unresolved:

 app/services/git_push_service.rb

```

See merge request !193

fixed merge conflict: git_push_service.rb



See merge request !194

[ES] Indexer should not trigger data validation

https://gitlab.com/gitlab-org/gitlab-ee/issues/301

See merge request !192

[ES indexer] Add NOT_INDEXED_ONLY option

https://gitlab.com/gitlab-org/gitlab-ee/issues/300

See merge request !187

number_with_delimiter() added

See merge request !2886

Bug found by Charles Sibbald at Sky.

Calls with patricio and Jacob confirmed this.

[ci skip]

See merge request !2877

No changes to nginx config in this update. Removed unnecessary instructions.

[ci skip]

See merge request !2879

Revert "Merge branch 'saml-decoupling' into 'master'"

This reverts commit c04e22fb, reversing
changes made to 0feab326.

Revert https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2782

See merge request !2878

This reverts commit c04e22fb, reversing
changes made to 0feab326.

Add release tracking for Sentry



See merge request !2863

Decouple SAML authentication from the default Omniauth logic

Fixes gitlab-org/gitlab-ee#178

With this merge request SAML gets its own login logic and its own `User` class under `lib/gitlab/saml/` This is needed to give SAML more versatility over how the authorization process works and to pave the way for the development of a SAML group sync as outlined here: gitlab-org/gitlab-ee#118

See merge request !2782

Use SCAN during 'rake cache:clear'

This allows 'rake cache:clear' to delete millions of keys without
choking. It requires Redis 2.8.0 or newer but we needed that already
anyway.

See merge request !2872

Only set autocrlf when creating/updating files

Related issue: gitlab-org/gitlab-ce#13457
Details: 5619a6de1dd6fc1dfd4053810c7b11c677b7a495

See merge request !2859

Uses cross browser niceScroll to do scrolling on sidebar.

Fixes: #13544 

Firefox does not support `-webkit-scrollbar` and there is no alternative for FF. So for example Gmail falls back to no fancy scrollbar. Stuck with jQuery, which is a good solution, since we already use it. 

This also leaves the default scrollbar as is. 

![Screen_Shot_2016-02-18_at_11.02.26_AM](/uploads/1184f06b71a8d9097ef1e3450a0c0ab3/Screen_Shot_2016-02-18_at_11.02.26_AM.png)

Also fixes horz scroll issue: 

![Screen_Shot_2016-02-18_at_11.09.56_AM](/uploads/63e9a8e824cac69a2745dd4dd84d1dfb/Screen_Shot_2016-02-18_at_11.09.56_AM.png)

cc @creamzy @dzaporozhets 

See merge request !2873

This allows 'rake cache:clear' to delete millions of keys without
choking. It requires Redis 2.8.0 or newer but we needed that already
anyway.