`safe_diff_files` directly modifies @message.diffs and was being called inside the HTML template
of the e-mail. By the time the text e-mail rendering occurs, the objects were already
wrapped by GitLab's diff helpers. This MR makes it explicit that the diff wrapper
will be used in both the text and HTML e-mail templates.

Closes gitlab-org/gitlab-ce#14497

Add ability to push to remote repositories

Closes #116 

See merge request !249

* Use Rugged filters to work with local/remote branches.
* Rename Project#remote_mirror? to Project#has_remote_mirror?
* Use delegate pattern for Repository#push_remote_branches and Repository#delete_remote_branches
* Make Repository#remote_tags return Gitlab::Git::Tag objects.
* Refactor Repository#remote_branches
* Rename Repository#push_branches to Repository#push_remote_branches
* Made other small refactors to views and specs.
* Make encrypted_credentials column size bigger.
  This was giving problems with MySql for large passwords.
* Refactor for UpdateRemoteMirrorService spec so we no longer
  harcode the branch names and specs are not broken after `gitlab-test`
  project is updated.

* Also fixed couple of small bugs introduced with last changes

* Also addressed feedback from https://gitlab.com/gitlab-org/gitlab-ee/commit/fcbfe56207f64da07deb7f3a8cbdcd505069edbd

* Now #url= and #url always handle the full URL, encryption is done transparently
* #safe_url was added for future purposes
* Little refactor for UpdateRemoteMirrorService

* Also added small fix for the scenario when the remote repo is empty
 and does not have tags.

* Add the ability to skip tags when fetching a remote repo.
  See: https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/46

Merge branch 'regression-ldap-group-synchronization-is-broken-for-our-company-s-ldap-with-gitlab-8-6-442' into 'master'

Fix LDAP group sync regression for groups with member value `uid=<username>`

Closes #442 

See merge request !335

Add specs for Projects::ApproversController



See merge request !327

[Elastic] Stabilize database indexer if database is inconsistent

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/459

See merge request !328

update gitlab-elastic-search gem

Fixes https://gitlab.com/gitlab-org/gitlab-elasticsearch-git/issues/3

See merge request !330

Instrument Rails cache code

See merge request !3619

Update gitlab-shell to 2.7.2

See merge request !3594

Use meta key to open todo in new tab

Fixes #15078 

See merge request !3623

Remove TODO for not documented stuff

We should not put a `TODO` in a released product.

See merge request !3553

First pass at a Testing styleguide

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14121

[ci skip]

See merge request !3465

Use more accurate timestamps for InfluxDB.

See merge request !3617

This allows us to track how much time of a transaction is spent in
dealing with cached data.

Use gitlab-workhorse 0.7.2

See merge request !3570

This is the inverse of 51894dbb.

This changes the timestamp of metrics to be more accurate/unique by
using Time#to_f combined with a small random jitter value. This
combination hopefully reduces the amount of collisions, though there's
no way to fully prevent any from occurring.

Fixes gitlab-com/operations#175

API: Expose subscribed? on issues and merge requests

This is the first start for the new `subscribable` API. It exposes the `subscribed` field for issues and merge requests.

Related to #6024

See merge request !3611

Fix Incorrect Quote In Docker Executor Example

## What does this MR do?
The corrected line opened with a regular quote (') but closed with a back-tick (`)  
I believe this is invalid bash syntax

## Are there points in the code the reviewer needs to double check?
Probably not

## Why was this MR needed?
Fixes error when example is copied and pasted

## What are the relevant issue numbers?
None

## Screenshots (if relevant)
None

See merge request !3604

Remove changelog entry for new navigation sidebar.



See merge request !3608

Fix side-by-side code format & commit message wrap

![Screen_Shot_2016-04-07_at_1.31.28_PM](/uploads/bad00284e4dfbec1fdd75220c34f4a98/Screen_Shot_2016-04-07_at_1.31.28_PM.png)

![Screen_Shot_2016-04-07_at_1.32.23_PM](/uploads/7cd344765025e93d0035934a473b4bb3/Screen_Shot_2016-04-07_at_1.32.23_PM.png)

See merge request !3605

Revert "Merge branch 'new-navigation-prototype' into 'master'"

This reverts merge request !3494

See merge request !3607

[ci skip]