Removed diverging commit count calculation from Repository#build_cache

Using a repository with 1000 branches the old `Repository#build_cache` method would take around 180 seconds to complete. Without calculating the diverging commit counts this method "only" takes around 60 seconds. 

See commit 28cc2413eb5ddf920ce0b5eed803121f8b884754 for more details. This fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/14058

cc @rspeicher 

See merge request !3274

Adds small AJAX optimistic functionality to todos.

Fixes #13656 <br/>
A good first step and boring solution. <br/>
Will make ajax call to remove each issue.  <br/>
If issue is last in group of issues will refresh page.  <br/>
If issues remain in group will remove row with JS.  <br/>
Adds loading spinner to button and disables. <br/>

![todos-optimistic](/uploads/c6aec4a688e5125d4df55a2a3a55d4d7/todos-optimistic.gif) <br/>

cc @dzaporozhets @JobV @dbalexandre 

See merge request !2946

Fixes issue with any milestone value in dropdown not being selectable

Closes #14293

See merge request !3234

Closes #14293

Add side padding to content-list if inside panel
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fixes #14367, #14349

See merge request !3273

Use relative links in `doc`, fix broken generated HTML links

Links like (doc/web_hooks/web_hooks.md) work in the GitLab source code
web interface, but the HTML generator produces broken links in the `doc`
subdirectories:  
http://doc.gitlab.com/ce/hooks/doc/web_hooks/web_hooks.html  
instead of the right one  
http://doc.gitlab.com/ce/web_hooks/web_hooks.html  
in  
http://doc.gitlab.com/ce/hooks/custom_hooks.html.

Fixes #14338 


See merge request !3261

Remove CI duplication.



See merge request !3290

Improve award emoji test reliability by checking that the emoji is displayed before the search field is focused

See merge request !3288

Check push permissions only when pushing directly to target branch.

Fixes #14374 

See merge request !3280

before the search field is focused

Fix bug causing dropdown to get cut off in project page

closes #14336 

### Before
![Screen_Shot_2016-03-16_at_11.30.40_PM](/uploads/9f8dd10f0627cdfbd49d7127b233b105/Screen_Shot_2016-03-16_at_11.30.40_PM.png)

![Screen_Shot_2016-03-16_at_11.30.53_PM](/uploads/6dfe64d68867d158a11be7e74cbd1520/Screen_Shot_2016-03-16_at_11.30.53_PM.png)


### After
![Screen_Shot_2016-03-16_at_11.30.14_PM](/uploads/2b87cc17522e8a425a97a78b36982873/Screen_Shot_2016-03-16_at_11.30.14_PM.png)

See merge request !3257

Fix inconsistency in the header of issue and merge request pages

closes #13550 

# For Issue Page

### Before
![Screen_Shot_2016-03-17_at_8.46.59_PM](/uploads/ede7f2b98395362ae87e6258cc10520a/Screen_Shot_2016-03-17_at_8.46.59_PM.png)

### After
![Screen_Shot_2016-03-17_at_8.48.56_PM](/uploads/da7adf17cb397ddc0677a6a5e8033b8e/Screen_Shot_2016-03-17_at_8.48.56_PM.png)

# For Merge request Page

### Before
![Screen_Shot_2016-03-17_at_8.45.45_PM](/uploads/10137827c05c8166a0aa429687e50d1b/Screen_Shot_2016-03-17_at_8.45.45_PM.png)

### After
![Screen_Shot_2016-03-17_at_8.45.01_PM](/uploads/92151c03cfe29b71090a1e0ad31abd6e/Screen_Shot_2016-03-17_at_8.45.01_PM.png)


See merge request !3279

Fixed alignment of download dropdown

With the new dropdown CSS - some dropdowns might look a bit odd

## Previously

![Screen_Shot_2016-03-16_at_11.46.04](/uploads/c1a8fc95ed4410de35d7bd5caedf28f5/Screen_Shot_2016-03-16_at_11.46.04.png)

## Now

![Screen_Shot_2016-03-16_at_11.45.26](/uploads/998637fe0872b2e826a8c17d183499dc/Screen_Shot_2016-03-16_at_11.45.26.png)

See merge request !3245

Fixed filter spacing

Closes #14350

![Screen_Shot_2016-03-17_at_10.21.33](/uploads/5b8f39134cc90ce1dd6565f665a39838/Screen_Shot_2016-03-17_at_10.21.33.png)

See merge request !3267

Bump Git version requirement to 2.7.4

[ci skip]

See merge request !3281

When calling Repository#build_cache we _don't_ want to build the
diverging commit count cache as doing so can be _very_ slow for
repositories with lots of branches. Because these caches are built
whenever needed (= when actually viewing the list of branches in the web
UI) we can safely remove this code from
Repository#build_cache.

This method is not used or tested anywhere.

Edited timeago text on comments

Unified the 'edited text' to be the same in descriptions and comments

Closes #5538 

See merge request !3063

Revert color for links inside gray areas

**Before**

![Screen_Shot_2016-03-17_at_12.23.17_PM](/uploads/55e518721d83c3bfc42edba3e97ec44d/Screen_Shot_2016-03-17_at_12.23.17_PM.png)

**After**

![Screen_Shot_2016-03-17_at_12.23.03_PM](/uploads/08fbf8e9139e4eadf191102cffd29617/Screen_Shot_2016-03-17_at_12.23.03_PM.png)

Reverts !3147

See merge request !3276

Hide builds from Project's settings when the feature is disabled

Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/13944

See merge request !3220

Cache project avatars stored in Git

Related issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/14363

See merge request !3272

The avatar logic has been moved from Project to Repository as this makes
caching easier. The logic itself in turn has been changed so that the
logo file names are cached in Redis. This cache is flushed upon pushing
a commit but _only_ if:

1. The commit was pushed to the default branch
2. The commit actually changes any of the logo files

If no branch or commit is given the cache is flushed anyway, this
ensures that calling Repository#expire_cache without any arguments still
flushes the avatar cache (e.g. this is used when removing a project).

Fixes gitlab-org/gitlab-ce#14363

Pre-selects values on issue and merge request dropdown

Closes #14290

See merge request !3233

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

Adjusted behavior so canceled builds tagged as allowed to fail do not fail build

## What does this MR do?
This diff changes the 'Allowed to fail' flag to also ignore canceled builds, whereas before, canceled builds could fail the suite even if they were marked as 'Allowed to fail'

dupe of !3258 to force a build

## Are there points in the code the reviewer needs to double check?
no

## Why was this MR needed?
Unexpected behavior as a user

## What are the relevant issue numbers?

## Screenshots (if relevant)
![whatisgoingon](/uploads/fcd7c8f3d8454bc730d7fd41eff59b31/whatisgoingon.png)

See merge request !3271

Merge duplicate cache entry in CI docs



See merge request !3208

PostReceive refactor

Back-ported PostReceive refactor made for https://gitlab.com/gitlab-org/gitlab-ee/issues/367 in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/267

See merge request !3264