Merge CE 531e4b to master

See merge request !316

These are not present in CE and seem to have originated from a merge
commit back in January. Since the selectors aren't used anywhere we can
just safely remove these files.

Reload forked_project_link projects

See merge request !3526

Hide user profile activity graph on mobile

closes #14507 

## Before
![Screen_Shot_2016-03-26_at_10.28.21_PM](/uploads/5d5e2f77de936c2f2cd8a95132720a81/Screen_Shot_2016-03-26_at_10.28.21_PM.png)

## After
![Screen_Shot_2016-03-26_at_10.27.01_PM](/uploads/c011497b31368a0b7aa7d851541ac301/Screen_Shot_2016-03-26_at_10.27.01_PM.png)

## Medium width screen
![fix2](/uploads/2a5eb2d01f1a516991cd3e2b35b8aadc/fix2.gif)

See merge request !3412

Fix award emoji picker for relative_url

MR !2888 caused a regression where the emoji picker does not load when
using relative_url, because the path for the controller was hardcoded.

See merge request !3493

This fixes ./spec/services/projects/unlink_fork_service_spec.rb which
somehow started failing on the master branch. It certainly isn't a very
elegant solution but seems to be the easiest/best way of solving this
problem for the time being.

Add labels to block element

Fixes #14083 


Before:![Screen_Shot_2016-04-04_at_11.22.27_AM](/uploads/c35afd95ebca1b72f2aa37c72dc3c1a9/Screen_Shot_2016-04-04_at_11.22.27_AM.png)

After: ![Screen_Shot_2016-04-04_at_11.21.34_AM](/uploads/94f180858cf8fe2fc7eeec541ce66d44/Screen_Shot_2016-04-04_at_11.21.34_AM.png)

See merge request !3492

Fix event rendering when create project
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

cc @jschatz1 

See merge request !3522

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

Merge CE 438e0c to master

See merge request !315

Remove fork link closes all merge requests opened on source project

Currently, if you:

- create a fork
- open a merge request on the source project
- remove the fork link

The created MR cannot be closed.

With this MR, all pending MR is closed when the fork link is removed.

See merge request !3189

Fix transparent bg for expand sidebar button
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

For #14838 

cc @jschatz1 

See merge request !3520

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

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

Migrate Repository#local_branches from gitlab-ee.

REF: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/249

This will help us to avoid posible merge conflicts when merging
gitlab-ce to gitlab-ee

See merge request !3496

Enable SpaceBeforeBrace rule for SCSS Lint

Also resolve all instances of spaces not being included before opening braces.

See merge request !3463

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix creation of merge requests for orphaned branches with images

When attempting to create a merge request from an orphaned branch (e.g. this happens for the first commit of any repo) that contained images, GitLab would fail with a Error 500. This MR fixes that problem.

Closes #14875

See merge request !3511

Added 8.7 CE to EE upgrade guide

See merge request !314

[ci skip]

Added 8.7 install/update guides

See merge request !3517

[ci skip]

Closes #14875

Improve rendering performance of Banzai

Related issues:

* gitlab-org/gitlab-ce#14315
* gitlab-org/gitlab-ce#13651

TODO:

* [x] `Banzai::Filter::ExternalIssueReferenceFilter#call` calls `Project#default_issues_tracker?` which runs a query on every call. Memoizing this only works if the `Project` instance is shared between instances of this filter. Either way it should at most only run this method once.
* [x] Fix the two failing specs
* [x] Clean of the various `call` methods in the filters where I inlined methods
* [x] Remove the `replace_XXX` methods in ReferenceFilter now that they're no longer used.

See merge request !3389

Cleaning this up any further is a bit tricky as the caches in question
should only be evaluated if RequestStore is actually enabled.

Fix bug related to filtering Issues by Label/Milestone.

See merge request !3499

Every object processed by ExternalIssueReferenceFilter can return a
different Project instance when calling "project". For example, every
note processed will have it's own associated Project. If we were to
cache Project#default_issues_tracker? on Project level this would have
no impact on Markdown rendering timings as the cache would have to be
built for every Project instance without it ever being re-used.

To work around this we cache Project#default_issues_tracker? in
Banzai::Filter::ExternalIssueReferenceFilter using the project's _id_
instead of the whole object. This setup allows re-using of the cached
data even when the Project instances used are different, as long as the
actual project IDs are the same.

For an issue with around 200 notes this cuts down timings by around 150
milliseconds.

These methods always return the same data for every class so there's no
point in computing their values on every call.

These filters now use a single iteration over all the document nodes
instead of multiple ones. This in turn allows variables to be re-used
(e.g. links only have to be unescaped once). Combined with some other
refactoring this can drastically reduce render timings.

This was originally suggested by @ayufan and modified to be a bit
cleaner and use RequestStore instead of a regular Hash.

By caching the output of the two methods involved the number of queries
is reduced significantly. For example, for an issue with 200 notes (of
which 100 reference a number of merge requests) this cuts down the
amount of queries from around 6300 to around 3300.

Build updates

Fixes #10851 

![build-updates](/uploads/52e09e679ca457f3d818f9a12fd8382b/build-updates.gif)


See merge request !2604