Fixes "create label" functionality on label dropdown

**Issue sidebar**

![label_dropdown](/uploads/2a056136fc88626530fc275ded0c2aa3/label_dropdown.gif)

**Issues page**

![label_dropdown_issues](/uploads/965fd20f5b206499e9b11a64556c5240/label_dropdown_issues.gif)



See merge request !3670

Remove the `.distinct` when finding issues

See merge request !3858

Disable 'repository check' feature in 8.7.0

See merge request !3856

Removed JS update templates

See merge request !3814

Filter labels by including ALL filter titles

Fixed query to use `AND` and not `OR`. Refactored relevant specs

See merge request !3815

Show project members only for members

fixes #5838 

See merge request !3752

Revert "Merge branch 'sentry-js' into 'master'"

This reverts commit 0f309794, reversing
changes made to 1e596fef.

See merge request !3851

The changelog got messed up during merging (I think?) with 8.7 entries
showing up in older versions.

Disable spellcheck and autocorrect for username field in admin page

closes #14855

## before
![Screen_Shot_2016-04-19_at_9.25.12_AM](/uploads/19387c4a11a879e9034a2179e932436e/Screen_Shot_2016-04-19_at_9.25.12_AM.png)

## after
![Screen_Shot_2016-04-19_at_9.25.47_AM](/uploads/60f4eba6a97201333dc64e46d625aac2/Screen_Shot_2016-04-19_at_9.25.47_AM.png)

See merge request !3730

Attempt to create pg_trgm extension in migration for test/dev environments

See merge request !3805

Fix cross-project label ref used with invalid project

When cross-project label reference was used with invalid project reference, `nil` was assigned to project variable which later caused an exception.

Closes #15168

See merge request !3811

Fixes issue with note form inheriting text color

It was only really noticeable on dark themed diffs

![Screen_Shot_2016-04-20_at_14.44.58](/uploads/4f32b487de7e4c09a494dc3c8c767ece/Screen_Shot_2016-04-20_at_14.44.58.png)

See merge request !3834

Discussion note icon shows up when you click on diff on touch screen

Fixes #15104 

* Fix bug that stopped discussion note button from showing up on iOS
* Shifted button a few `px` to fix slight cutoff
<div>
<img src="/uploads/9d507091f33aa69ef68323386bf3a5c2/Screen_Shot_2016-04-15_at_12.08.46_PM.png" width="300px">
<img src="/uploads/a964a2a46636cbe4593abf272b5796f7/Screen_Shot_2016-04-15_at_12.11.40_PM.png" width="300px">
</div>

See merge request !3755

Fix setting of "action" for Grape transactions

After wondering why we're not getting all the data in Grafana that I
wanted I realized I wasn't setting the "action" field properly here.

See merge request !3842

Wrap all code in diffs

Closes #15382  
Closes #15422  
All diff code wraps to next line instead of scrolling

<img src="/uploads/ec5754919bac0b027fcb122bb88435b3/Screen_Shot_2016-04-20_at_12.22.27_PM.png" width="500px">

See merge request !3838

Add due date to issues

Closes: #12709

See merge request !3614

Add Sentry logging for JavaScript errors

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/12675

See merge request !3795

Update changelog



See merge request !3801

fix bug causing the infinite scrolling in activity feeds to break when you click a link and navigate back

![arrg_](/uploads/53b2a01d3b55938cc12c805e1a81ff6b/arrg_.gif)

See merge request !3835

Increased z-index of right sidebar

Fixes issue with active button overlapping it

Closes #15243

See merge request !3722

Add margin to top of form actions

Closes #15213

Also fixes other modal inputs (like add new directory, etc)  

![Screen_Shot_2016-04-20_at_1.47.14_PM](/uploads/14b474da2f86dcc3c1afd9e8ea09e812/Screen_Shot_2016-04-20_at_1.47.14_PM.png)

See merge request !3841

Removed duplicate ID's from the HTML



See merge request !3818

Render relative timestamps for all commits in projects commit list

fixes #15366 

See merge request !3821

Fixed issue with sidebar edit links toggling anchor

This caused an issue with the page scrolling from the bottom to the top. Also stopped the dropdown links doing the same.

See merge request !3819

Removed commented text from system notes

![Screen_Shot_2016-04-20_at_14.49.22](/uploads/b1617af49cc35595afd6dfcf761a775c/Screen_Shot_2016-04-20_at_14.49.22.png)

See merge request !3836

Fixed issue with new MR form layout

Currently it is all over the place:

![Screen_Shot_2016-04-20_at_14.59.48](/uploads/09c3dffc2138140e3b009ab2564f0aca/Screen_Shot_2016-04-20_at_14.59.48.png)

Now:

![Screen_Shot_2016-04-20_at_14.59.44](/uploads/ef5ba8b7393253ecb732c57ba37dd0cf/Screen_Shot_2016-04-20_at_14.59.44.png)

See merge request !3837

Verify the MR being displayed question has a merge commit set and can be cherry-picked

See merge request !3830

Add incremental build trace update API

Closes #14537 

Must be merged if we want changes from gitlab-org/gitlab-ci-multi-runner!124 to work.

See merge request !3447

Mutliple label filter

Fixes #989 

See merge request !3438

Refresh page according remaining todos

Fixes #14678 

See merge request !3428

License templates when creating/editing a LICENSE file

Closes #12804

See merge request !3660

Add raw build trace output

Closes #15308, #15147

Changes in the UI:

- on finished build:

    ![raw-on-finished-build](/uploads/0e0904940db5b381ae064d49343c6508/raw-on-finished-build.png)

- on running build:

    ![raw-on-running-build](/uploads/0e4c800b68c12bdd0cbd2eea732b22ff/raw-on-running-build.png)

See merge request !3767

add slack notifications for wiki pages

## What does this MR do?

Lets the Slack service be configured to send notifications when wiki pages are created or edited.

## Are there points in the code the reviewer needs to double check?

I'm just starting to get familiar with the Gitlab codebase and I was unsure on how to get the wiki page url to pass it to the slack message, on whether or not I needed to refactor the create/update methods for wiki pages from the controller to a service (but seemed necessary to test it better), and if I needed to add a column to the web hooks table or if the services table would have been enough. Please let me know if I should change anything and I will improve the MR, thanks for checking :)

## Why was this MR needed?

Related to #563 and fixes #4233.



See merge request !2998

Fix javascript errors with invalid json because of commas

fixes #15390 

See merge request !3827

Define constants only if not defined yet and freeze them

Fixes #15139.

See merge request !3810