Fix project header alignment media query bug
## What does this MR do?
Fixes media query bug on project header
## Screenshots (if relevant)

See merge request !4689
Add bottom padding for merge request command line text
Because without bottom padding text is too close to the UI tabs - hard to navigate
See merge request !4681
Avoid a TypeError when initializing MergeRequest JS class with no arg
## What does this MR do?
Avoid a TypeError when initializing MergeRequest JS class with no arg.
## Are there points in the code the reviewer needs to double check?
No.
## Why was this MR needed?
Without this sane default you would get the following error when you
tried to instantiate a new MergeRequest object with no argument (i.e.
`new MergeRequest();`):
TypeError: undefined is not an object (evaluating 'this.opts.action')
## What are the relevant issue numbers?
Fixes#13525.
## Does this MR meet the acceptance criteria?
- [x] No CHANGELOG since it's a trivial internal change
- [x] Tests
- [x] Added for this feature/bug
- [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
See merge request !4667
Fixed alignment of download dropdown
## What does this MR do?
Correctly aligns the download dropdown on merge requests
## Screenshots (if relevant)

See merge request !4646
Fixed last push event banner not being in container
## What does this MR do?
Adds the last push event content into a container with the correct class.
## What are the relevant issue numbers?
Closes#18567
## Screenshots (if relevant)

See merge request !4644
Fixed issue when opening a highlighted line diff
## What does this MR do?
With the new project nav being fixed, the diff page is scrolling the highlighted under the nav meaning you cant see what is highlighted. This corrects that by added the height of the new project nav into the offset.
See merge request !4597
Shows build scroll buttons after build is complete
## What does this MR do?
Shows the build scroll buttons whenever there is a build trace. Previously they were only shown when the build was active.
## What are the relevant issue numbers?
Closes#18515
## Screenshots (if relevant)

See merge request !4621
Fix images in emails
Closes#18474. The confirmation email is actually the only one that uses the `image_tag` helper at the moment, but this will work for all of them:
```shell
$ ag image_tag -G mailer
app/views/layouts/devise_mailer.html.haml
13: = image_tag('mailers/gitlab_header_logo.png', id: 'logo', alt: 'GitLab Wordmark')
24: = image_tag('mailers/gitlab_tanuki_2x.png', alt: 'GitLab Logo')
```
See merge request !4705
Lighten each logo path color instead of white
## What does this MR do?
Changes highlight/loading colors of tanuki from white to a lighter version of each path color
## Why was this MR needed?
Since the logo is no longer on the dark sidebar, the highlight color was getting lost against the light gray background
## What are the relevant issue numbers?
Closes#18521
## Screenshots (if relevant)

cc @jschatz1 @lbennett @dzaporozhets
See merge request !4690
Improve pipeline status in case that pipeline has no jobs
## What does this MR do?
This MR resolves problem with pipeline status when there are no build in pipeline.
This can happen when builds were skipped - for example - by using `only`/`except` keyword in `.gitlab-ci.yml`.
## What are the relevant issue numbers?
Closes#17977
See merge request !4403
Fix permission checks in member row (backport from gitlab-org/gitlab-ee!460)
## What does this MR do?
It improves the check we use to display or not the members' access and controls in the members list.
## Are there points in the code the reviewer needs to double check?
No, I replaced an helper with just a permission check so I think it's a better solution.
## Why was this MR needed?
There were a spec failure in gitlab-org/gitlab-ee!460 because of the refactor done in the "request access" MR.
## What are the relevant issue numbers?
None.
## Does this MR meet the acceptance criteria?
- No CHANGELOG needed
- [x] Tests
- [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
See merge request !4670
Turn Group#owners into a has_many association
## What does this MR do?
This turns the regular method `Group#owners` into a `has_many` association.
## Are there points in the code the reviewer needs to double check?
As far as I can tell there's no way to do this without using an intermediate association, but perhaps I'm missing something. The reason an intermediate association is needed is because the supplied Proc is applied to the _final_ association (the one returning users), this means that when using a single `has_many` you can't filter out any intermediate rows (e.g. group members).
## Why was this MR needed?
This code being a regular method would prevent eager loading of the owners of a Group, turning it into a `has_many` association resolves this problem. This was discovered in !4410.
## What are the relevant issue numbers?
None.
## Does this MR meet the acceptance criteria?
- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [x] ~~API support added~~
- [ ] Tests
- [x] Added for this feature/bug
- [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
See merge request !4676
Hide the Todo button in the collapsed issuable sidebar.
## What does this MR do?
Fixes a bug where the "Add Todo" button was displayed in the collapsed sidebar.
## Are there points in the code the reviewer needs to double check?
This shouldn't remove any other elements from the collapsed sidebar.
## What are the relevant issue numbers?
None
## Screenshots (if relevant)
Before:

After:

See merge request !4686
Fix long commit message scroll issue.
Fixes horizontal scrollbar for long commit description.
## Before

## After

See merge request !4643
Show categorised search queries in the search autocomplete
Fixes#5885
It works in 3 categories, Dashboard, Groups and Project.
## Dashboard context

## Group context

## Project context

## Screencast

See merge request !4499
Replace raphael-rails with raphael.js and split it from the rest of the JS
## What does this MR do?
Removes raphael.js and its related libraries from the default JS bundle.
It also removes raphael-rails because the gem is unmaintained and – for whatever reason – didn't want to cooperate with the way I was trying to require it.
This brings the default (compressed and minified) application.js from 354KB after the d3 MR (!4394) down to 324KB.
## Are there points in the code the reviewer needs to double check?
That tests pass and that there aren't errors on any pages (especially the Network page).
## Why was this MR needed?
It's only used on the Network page and was using way too much bandwidth for just one page.
## What are the relevant issue numbers?
#14372#13165
Follow-up to !4394 and !4516.
cc: @jschatz1
See merge request !4519
Updated '.event-item a' color
## What does this MR do?
Changes the color of `.event-item` links.
## Are there points in the code the reviewer needs to double check?
Did you want this restricted only to the activity page or anywhere showing `.event-item`'s?
## Why was this MR needed?
UX
## What are the relevant issue numbers?
Closes#18047.
## Screenshots (if relevant)

See merge request !4544
added hover state to top nav links
## What does this MR do?
Adds hover state to top nav links.
## Are there points in the code the reviewer needs to double check?
Ney.
## Why was this MR needed?
UX.
## What are the relevant issue numbers?
Closes#18301.
## Screenshots (if relevant)

See merge request !4521
Due date can be removed from milestones
## What does this MR do?
Adds a button to milestone form to allow user to remove due date
## What are the relevant issue numbers?
Closes#15063
## Screenshots (if relevant)

See merge request !4428