Fix privilege escalation issue with OAuth external users

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/19312

This MR fixes a privilege escalation issue, where manually set external users would be reverted back to internal users if they logged in via OAuth and that provider was not in the `external_providers` list.

/cc @douwe 

See merge request !1975

[ci skip]

Insert notification settings dropdown into groups

## Display notification settings dropdown for groups

part of #3359   

![groups](/uploads/d61648236b81b0cca55fa2d73758f0df/groups.png)
![Screenshot_from_2016-06-29_10-58-37](/uploads/7be05ea6002932c094a81b25a308fd62/Screenshot_from_2016-06-29_10-58-37.png)  
![small](/uploads/6f2b556d734c870e358f6f56618a0bab/small.png)

See merge request !4857

Fixed search field blur not removing focus

## What does this MR do?

Adds a blur event to remove focus styling from the search input.

Any particular reason we were looking for clicks on the document? I can't see why we would be.

## What are the relevant issue numbers?

Closes #18670 

## Screenshots (if relevant)

![tab](/uploads/4c74d4f76ec7b45bfcf581606d2defb5/tab.gif)

See merge request !4704

optimize png images losslessly using zopflipng

Resend https://github.com/gitlabhq/gitlabhq/pull/10354#issuecomment-222194091

Optimized 246 png images losslessly using Google's zopflipng.
```
 app/assets/images/auth_buttons/azure_64.png        | Bin 986 -> 695 bytes
 app/assets/images/auth_buttons/bitbucket_64.png    | Bin 2163 -> 2161 bytes
 app/assets/images/auth_buttons/facebook_64.png     | Bin 2970 -> 870 bytes
 app/assets/images/auth_buttons/github_64.png       | Bin 2625 -> 1151 bytes
 app/assets/images/auth_buttons/gitlab_64.png       | Bin 2849 -> 2070 bytes
 app/assets/images/auth_buttons/google_64.png       | Bin 5281 -> 4366 bytes
 app/assets/images/auth_buttons/twitter_64.png      | Bin 4835 -> 3110 bytes
 app/assets/images/bg_fallback.png                  | Bin 167 -> 167 bytes
 app/assets/images/dark-scheme-preview.png          | Bin 3996 -> 3992 bytes
 app/assets/images/emoji.png                        | Bin 263533 -> 263346 bytes
 app/assets/images/emoji@2x.png                     | Bin 690504 -> 689076 bytes
 app/assets/images/gitlab_logo.png                  | Bin 5189 -> 3616 bytes
 app/assets/images/gitorious-logo-black.png         | Bin 809 -> 631 bytes
 app/assets/images/gitorious-logo-blue.png          | Bin 495 -> 201 bytes
 app/assets/images/icon-link.png                    | Bin 1128 -> 729 bytes
 app/assets/images/images.png                       | Bin 5849 -> 5806 bytes
 app/assets/images/monokai-scheme-preview.png       | Bin 3711 -> 3708 bytes
 app/assets/images/msapplication-tile.png           | Bin 5798 -> 4328 bytes
 app/assets/images/no_avatar.png                    | Bin 621 -> 621 bytes
 app/assets/images/no_group_avatar.png              | Bin 942 -> 939 bytes
 app/assets/images/slider_handles.png               | Bin 1377 -> 1341 bytes
 app/assets/images/touch-icon-ipad-retina.png       | Bin 8130 -> 5662 bytes
 app/assets/images/touch-icon-ipad.png              | Bin 3493 -> 2465 bytes
 app/assets/images/touch-icon-iphone-retina.png     | Bin 4997 -> 3460 bytes
 app/assets/images/touch-icon-iphone.png            | Bin 2766 -> 1949 bytes
 doc/administration/img/housekeeping_settings.png   | Bin 23856 -> 19347 bytes
 .../img/build_artifacts_browser.png                | Bin 89132 -> 82102 bytes
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 spec/fixtures/dk.png                               | Bin 1143 -> 1062 bytes
```

cc @connorshea

See merge request !4325

Fixed privilege escalation issue where manually set external users would be reverted back to internal users if they logged in via OAuth and that provider was not in the `external_providers` list.

Changes calendar activities to use target reference

## What does this MR do?

Uses the targets reference in the calendar activities list. Previously it was using `#` which is wrong for merge requests.

## Screenshots (if relevant)

![Screen_Shot_2016-06-29_at_14.29.08](/uploads/4c52bbc7ca68d7b25e5bfb11ea55eef7/Screen_Shot_2016-06-29_at_14.29.08.png)

See merge request !4992

Removed fade when filtering results

## What does this MR do?

Removes the `opacity` change when filtering results seeing as we now do `Turbolinks.visit` it isn't required.

Best way to see issue - filter issues & then go back. Will still have opacity styling.

See merge request !4932

Bugzilla Integration

## What does this MR do?
Adds Bugzilla as a project service for external issue tracking

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

## Why was this MR needed?
Provides a notable Bugzilla option for use as an external issue tracker.  Existing Custom Issue tracker can be used to setup Bugzilla but this makes it clear that Bugzilla is an option.

## What are the relevant issue numbers?
Closes #14669

## Screenshots (if relevant)

## 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)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [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 !4930

Add fog-rackspace microgem to support backups using rackspace provider

## What does this MR do?

Adds fog-rackspace gem to Gemfile.

## Why was this MR needed?

Because fog moved the rackspace provider to separate gem.

## What are the relevant issue numbers?

#19197

See merge request !4986

Use update_columns to by_pass all the dirty code on active_record

See merge request !4985

We think this is valid because we’re just storing new data that always will be valid

Reduce overhead and optimize ProjectTeam#max_member_access performance

See merge request !4973

The previous implementation would load the entire team member list and their
respective attributes. Now we only search for the user's specific
access level.

In gitlab-com/operations#42, this reduces the overall overhead of rendering
the issue from 28% to 20%.

First step of optimizing #19273

rebased with latest changes from master

Rebased to resolve merge conflicts

Requested in #14669

Added note to changelog

PipelinesFinder use git cached data

See merge request !4984

Fixes missing avatar on system notes

Closes #17295


![Screen_Shot_2016-06-27_at_12.50.50_PM](/uploads/b142226e608ccfe751a9b6059f57c9ec/Screen_Shot_2016-06-27_at_12.50.50_PM.jpg)

See merge request !4954

Markdown toolbar inserts code blocks

## What does this MR do?

Adds the ability to insert code blocks with the markdown toolbar buttons. This is done by selecting the block & then clicking the code button.

## What are the relevant issue numbers?

Closes #19173 


See merge request !4950

Fixed avatar alignment in new MR view

## What does this MR do?

Fixes the alignment of the avatar in new MR view.
Closes #19076 

## Screenshots (if relevant)

![Screen_Shot_2016-06-24_at_12.53.58](/uploads/fc94faf2e48f194852693b7ae79e8fa3/Screen_Shot_2016-06-24_at_12.53.58.png)

See merge request !4901

Workhorse to serve email diffs

See merge request !4590

Show basic system info on admin panel. Closes #18886

![Screen_Shot_2016-06-23_at_10.57.07_AM](/uploads/df33bc3dc36ceaf86f5e479ca15b83f3/Screen_Shot_2016-06-23_at_10.57.07_AM.png)

See merge request !4858

Fix group visibility form layout in application settings

## What does this MR do?

This fixes UI consistency related to setting group visibility levels in application settings. See screenshots.

## Screenshots (if relevant)

#### Before

![visiblity_consistency](/uploads/9cf9b517e25cd661ac61bdd7ca2d82f4/visiblity_consistency.png)

#### After

![group_visibility_after](/uploads/7b317684d047716f2aa5e60d19a4281b/group_visibility_after.png)

See merge request !4848