Added ability to add custom tags to transactions

cc @pcarranza 

See merge request !3674

Adjust the default trusted_proxies to only include localhost

And also allow other trusted proxies to be added from the config.yml.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/3538

Omnibus config: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1208

See merge request !3524

Tie example config to JIRA screenshot

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15203

See merge request !3693

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15203

One use case for this is manually setting the "action" tag for Grape API
calls. Due to Grape running blocks there are no human readable method
names that can be used for the "action" tag, thus we have to set these
manually on a case by case basis.

Allow to close invalid merge request

fixes #15044

See merge request !3664

Docs for the new branch button

[ci-skip]

Closes #3886 

@axil Could you check this and make sure this is up to your standards?



See merge request !3425

Fix repository cache invalidation issue when project is recreated with an empty repo

See merge request !3692

[ci skip]

API: Ability to update a group

This makes it much easier to update a group after introducing the group visibility.

* Closes #14991 

See merge request !3587

To reproduce:

1. Create a project with some content
2. Rename the project
3. Create a new project with the same name.
4. Boom - 404.

After step 2, the branch and tag counts were not being cleared. This would
cause `repository.has_visible_content?` to erroneously return `true`
for the newly-created project.

Closes #13384

Wrap text in notes box if longer than code in diff

* Fixes branch name overflow
* Text and inline `code` wraps in comments
* `code` blocks scroll horizontally

![Screen_Shot_2016-04-11_at_4.59.15_PM](/uploads/39eee7d35ea79d1a3944aa6281b72121/Screen_Shot_2016-04-11_at_4.59.15_PM.png)

See merge request !3626

Fix todo_target_path for todos where target was removed

Fixes #15187 

See merge request !3684

Update spring and spring-commands-spinach

Spring changelog: https://git.io/vVAUY

See merge request !3681

Fix datetimes on tooltips

Closes #14206 

Updates tooltip datetimes on `.timeago()` instances. 

**Inline notes**

![Screen_Shot_2016-04-07_at_1.25.12_PM](/uploads/2f55390a7e91dabf75e71fe3bda91849/Screen_Shot_2016-04-07_at_1.25.12_PM.png)

**Existing and new notes**

![Screen_Shot_2016-04-07_at_1.24.49_PM](/uploads/202bb7476738eb048f2d94abb68174e7/Screen_Shot_2016-04-07_at_1.24.49_PM.png)


**Issuable dates**

![Screen_Shot_2016-04-07_at_1.24.32_PM](/uploads/80fd5cc3c06fade0b1c615bc7b7611a8/Screen_Shot_2016-04-07_at_1.24.32_PM.png)

**Build dates**

![Screen_Shot_2016-04-07_at_1.25.02_PM](/uploads/832f43284005ea610a3ad54a49b97104/Screen_Shot_2016-04-07_at_1.25.02_PM.png)

See merge request !3497

Spring changelog: https://git.io/vVAUY

Check and report import job status to help diagnose issues with forking

There are no functional changes, but adding checks/logs for Sidekiq job IDs to help track down why many users seem to get stuck fork/import jobs.

See merge request !3672

Project dropdown in header uses new dropdown



See merge request !3339

Adjust the default trusted_proxies to only include localhost, and allow other trusted proxies to be configured.

Fix emoji aliases not showing in autocomplete

closes #14948 

See merge request !3595

Fixed issue with member access not being visible on notes

This happened because the `note-actions`, which houses the access, was wrapped in a `can_edit` if statement

![Screen_Shot_2016-04-08_at_16.02.47](/uploads/40bffe9bb53c015f30ffa93bb018552b/Screen_Shot_2016-04-08_at_16.02.47.png)

Fixes #15049

See merge request !3618

Fix quick submit missing in edit merge request page

closes #14953 

![fix](/uploads/5b80b37330929514c81299b4c8fe3efb/fix.gif)

See merge request !3601

Updated media query for admin/groups search box

@jschatz1 based on your comment https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3523#note_4632743

See merge request !3599

Fixed colour of dropdown link hover

![Screen_Shot_2016-04-07_at_16.02.40](/uploads/bfbfa5d1b82576b6bafaefd567effa06/Screen_Shot_2016-04-07_at_16.02.40.png)

See merge request !3596

Added CHANGELOG item

Fix labels not displayed on todos page

closes #14512,#13920

# For Todos

## Before
![Screen_Shot_2016-03-23_at_8.59.32_PM](/uploads/0c22c7674783031c9be842860082fdc2/Screen_Shot_2016-03-23_at_8.59.32_PM.png)

## After
![Screen_Shot_2016-03-24_at_12.35.06_PM](/uploads/f62d3f39c0aa2f7079368e157a3a558c/Screen_Shot_2016-03-24_at_12.35.06_PM.png)

# For Activity Feed

## Before
![Screen_Shot_2016-03-24_at_12.37.41_PM](/uploads/744370db7a4bd3782c029d80c3694ee7/Screen_Shot_2016-03-24_at_12.37.41_PM.png)

## After
![Screen_Shot_2016-03-24_at_12.37.00_PM](/uploads/9939817c14e98b50b3e16c8b7b9cf009/Screen_Shot_2016-03-24_at_12.37.00_PM.png)

See merge request !3371