Support supressing text file diffs on the default branch with .gitattributes

This change allows users to suppress diffs for text files by adding an entry to the `.gitattributes` file. To take effect the file present at the HEAD of the default branch.

When rendering a diff, if the file is text according to the charlock holmes gem (via the `text?` method) but the file is not diffable according to the project repository, then a message is displayed stating that the diff was suppressed.

![image](/uploads/2e119b725875a301e30d9ad482e283b3/image.png)

I looked into ways to do this using a `binary` flag as suggested by @stanhu in [this comment](https://gitlab.com/gitlab-org/gitlab-ce/issues/2315#note_4435454), however, there was no good way to seperate what was a real binary file from one that had been marked as not diffable in `.gitattributes`.

Fixes and closes gitlab-org/gitlab-ce#2315.

See merge request !3806

This is a combination of 3 commits.

- Update the bare repositories info/attributes if the default branch is updated
- Check the diff attributes of a file before showing a diff
- Update CHANGELOG

Remove deprecated CI badge helper

Closes #13446

See merge request !3977

Use a better message when milestone is newly created

closes #14982

See merge request !3925

Fixed CHANGELOG for 8.7.1/8.7.2

See merge request !3978

[ci skip]

Replace outdated bluish colors with default bg color

cc @skyruler 

See merge request !3973

Closes #13446

make some changes for the checks to determine when the messages should be displayed

add item to changelog and also integration test

make some changes to the test

make some changes

Properly handle bigger files

Closes #3967

See merge request !3718

Load the "New Branch" button asynchronously

Here's how it looks like for logged in users:

![new_branch](/uploads/718e3d9016a50a0432b9541dde5ca74c/new_branch.gif)

And here it is for anonymous users (or when a new branch can't be created by a logged in user):

![new_branch_anonymous](/uploads/dce42ee6a7dd7708443cdfdb56389d46/new_branch_anonymous.gif)

See merge request !3855

Protected branches UI

![Screen_Shot_2016-04-26_at_15.50.10](/uploads/4b905db031aab412bc01616e0be36c1b/Screen_Shot_2016-04-26_at_15.50.10.png)

![Screen_Shot_2016-04-26_at_15.50.00](/uploads/b09229b364ec5361fce375299d39d99c/Screen_Shot_2016-04-26_at_15.50.00.png)

Closes #14027

See merge request !3929

Project webhooks updated UI

Closes #13993 

![Screen_Shot_2016-04-26_at_10.55.52](/uploads/684f79be18f8a69e9b5cbcca2c9b20e8/Screen_Shot_2016-04-26_at_10.55.52.png)

![Screen_Shot_2016-04-26_at_10.55.37](/uploads/9b9f3a8a243dec955f23967e20ec514f/Screen_Shot_2016-04-26_at_10.55.37.png)

See merge request !3922

Project deploy keys updated UI

Closes #13992

See merge request !3912

This button depends on Issue#can_be_worked_on? which in turn depends on
Issue#related_branches. By rendering this button asynchronously we can
finally remove all usages of Issue#related_branches and
Issue#referenced_merge_requests from the issues "show" page.

Enable the UrlFormat and UrlQuotes SCSS Linters.

There were no lints to fix for this one, so it's just preventative.

UrlFormat: URLs should be valid and not contain protocols or domain names.

UrlQuotes: URLs should always be enclosed within quotes.

cc: @jschatz1 

See merge request !3770

Add Safari search box bug fix to changelog



See merge request !3951

Updated triggers UI

![Screen_Shot_2016-04-27_at_14.05.35](/uploads/971bc907f62abd397368c8c088ff0cf1/Screen_Shot_2016-04-27_at_14.05.35.png)

![Screen_Shot_2016-04-27_at_14.05.32](/uploads/5e0e87998e25e7e89cdd6fb8d6035542/Screen_Shot_2016-04-27_at_14.05.32.png)

Closes #14090

See merge request !3946

Project group UI

Closes #13991 

![Screen_Shot_2016-04-25_at_14.54.49](/uploads/e55fd1731a479d93660a1ff8359f56d6/Screen_Shot_2016-04-25_at_14.54.49.png)

See merge request !3911

Fix Todos test

Another attempt to fix random fail on Todos test.

See merge request !3953

Grey header and fluid profile navigation

Based on https://gitlab.com/gitlab-org/gitlab-ce/issues/14838#note_5083863 

cc @skyruler

See merge request !3968

Replace gitlab-workhorse with GitLab Workhorse where appropriate

For the output to be consistent with the other services.

See merge request !2512

Disable Rack Attack if admin disables it in config file

Grack::Auth already checks this variable. These holdouts were not disabled, leading to confusion when debugging a customer issue.

See merge request !3918

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

Prepend letter v to GitLab Workhorse version numbers

This helps to address gitlab-org/gitlab-ce#12684 so as to maintain consistency in all GitLab projects.

It also addresses: https://gitlab.com/gitlab-org/gitlab-workhorse/issues/4

Next Steps

- create a set of duplicate tags in workhorse to prevent errors when updating from the patch guide


See merge request !3088

Build status `canceled` if any of the jobs canceled

Before this change in case of any of the jobs had been canceled, build status was `failed`.

Closes #14207

See merge request !3778

Use ActionDispatch Remote IP for Akismet checking

Previously all remote IPs appeared at 127.0.0.1, which made Akismet
not very useful. Using the ActionDispatch Remote IP (http://api.rubyonrails.org/classes/ActionDispatch/RemoteIp.html)
should provide more reliable results.

Closes #16629

See merge request !3961

Users can use the feature proposal label inside the issue

Got the idea from https://gitlab.com/gitlab-org/gitlab-ce/issues/12620.

\cc @JobV @sytses 

See merge request !2574

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

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

Send 'admin emails' weekly, not daily

Daily seems to be to spammy, so let's default to weekly instead.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15520

See merge request !3923

[ci skip]

Update using_docker_build.md, clarify the 'privileged' mode requirement

Related to #15428

Fixes gitlab-org/gitlab-ci-multi-runner#1261

See merge request !3909