Remove duplicate cross-project reference from sidebar

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/7962

[ci skip]

See merge request !114

[ci skip]

Fast-forward merge when build succeeds + semi-linear history rebasing and merge commits.

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/28.

I'll backport 1d6c271e and 9292d8e6 to CE.

To do:

- [x] Test
- [x] More screenshots :)

## Settings

Old:

![Screen_Shot_2016-01-07_at_16.56.42](/uploads/b5a8db9d761a5442d8787ea4913f6f93/Screen_Shot_2016-01-07_at_16.56.42.png)

(The "Rebase button" option used to only be available when "Only fast-forward merges" is checked)

New:

![Screen_Shot_2016-01-07_at_16.57.57](/uploads/1a000cc8bd02aa9e5b053cb52ed8c3c8/Screen_Shot_2016-01-07_at_16.57.57.png)


## Merge widget

### With "Fast-forward merge" or "Merge commit with semi-linear history", when ff merge is NOT possible

![Screen_Shot_2016-01-12_at_16.21.16](/uploads/e3e1ec924b9783b01054fea1446c8235/Screen_Shot_2016-01-12_at_16.21.16.png)

### After "Rebase" button is clicked

![Screen_Shot_2016-01-12_at_16.24.39](/uploads/99619afd73df5850b5620734875add05/Screen_Shot_2016-01-12_at_16.24.39.png)

### When MR is viewed during rebasing

![Screen_Shot_2016-01-12_at_16.24.42](/uploads/80b6d314880c80530810e029988dd216/Screen_Shot_2016-01-12_at_16.24.42.png)

### With "Fast-forward merge", when ff merge is possible

![Screen_Shot_2016-01-12_at_16.19.26](/uploads/0b9e3b82ace27149c9c337b09d519396/Screen_Shot_2016-01-12_at_16.19.26.png)

### With "Merge commit" or "Merge commit with semi-linear history", when ff merge is possible

![Screen_Shot_2016-01-12_at_16.20.07](/uploads/30589140b304db55bc58c2c7ae9e1c90/Screen_Shot_2016-01-12_at_16.20.07.png)

See merge request !110

Update to CE commit 777771

This ensures both CE and EE have the same code in the master branch for the RC release.

See merge request !113

merge request close message moved and merge request now refered by `!`.

Fixes #4161 

![Screen_Shot_2016-01-12_at_8.38.57_AM](/uploads/9390ce0ebd1d14bfc83130ff4913a823/Screen_Shot_2016-01-12_at_8.38.57_AM.png)

See merge request !2387

Disable colorization if STDOUT is not a tty

Closes #6118 

See merge request !2403

Block the reported user before destroying the record

This is intended to prevent the user from creating new objects while the
transaction that removes them is being run, resulting in objects with
nil authors which can then not be edited.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/7117

See merge request !2402

Make sure time_ago_with_tooltip is using a Time object

Somehow this test existed on EE but not in CE, so it started failing
after a bad CE-to-EE merge.

See merge request !2398

Comment and close button does not submit comment



See merge request !2399

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

Include the user_id in user_*_team system hooks.

Mention channel/key bug in irkerd docs

It patches core classes (such as String) to add colorization methods
like `red` which we can't disable the same way we can with the
Colorization gem.

This is intended to prevent the user from creating new objects while the
transaction that removes them is being run, resulting in objects with
nil authors which can then not be edited.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/7117

Prepare Installation and Update docs for 8.4 RC1

[ci skip]

See merge request !2401

See merge request !107

[ci skip]

[ci skip]

Per this issue: https://gitlab.com/esr/irker/issues/2

A documentation update was added to irkerd (https://gitlab.com/esr/irker/commit/190808c37d4ab5f0f16fe35352ff36863c2732d5) but the bug is still there. Making a note of it here could save someone a lot of hassle. 

This could probably be worded better if someone else wants to take a stab at it.

Revert "Remove the `:coffee` and `:coffeescript` Haml filters"

This reverts commit ae7de2f8.

Several files in EE still use the `:coffeescript` filter and
I don't have time to fix them before the CE-to-EE merge.

See https://gitlab.com/gitlab-org/gitlab-ee/builds/553647

I will reintroduce this change in a future MR.

See merge request !2400

[ci skip]

Also reformats paragraphs for a max width of 80 chars

[ci skip]

Closes #152

This reverts commit ae7de2f8.