More highlighted diff fixes

See merge request !2545

Fix grammar and typos in file finder docs



See merge request !2547

[ci skip]

Make sure non-highlighted diffs are still escaped

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/12521

See merge request !2544

File finder can be invoked from anywhere!



See merge request !2543

[ci skip]

Add method to calculate total size of artifacts in subpath

See merge request !2500

Diff highlight themes

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/12484

See merge request !2530

Add housekeeping feature documentation

Add documentation about the new housekeeping feature in the project settings page.

See merge request !2371

[ci skip]

Add file finder documentation

Closes #7966 

See merge request !2541

[ci skip]

Milestone drag & drop cursor

Fixes #4097 

![grab-cursor](/uploads/f5071d7e4839c3b4b88c9f7f1270eee3/grab-cursor.gif)

cc @jschatz1 @creamzy 

See merge request !2532

Add basic documentation for build artifacts

/cc @axil @ayufan 

See merge request !2511

Add documentation on restarting GitLab

This will save as time from writing the same commands
over and over again.

See merge request !2510

[ci skip]

[ci skip]

Do not use progress bar when downloading build artifacts

Closes #12491

See merge request !2531

Remove execution permissions from font assets

[ci skip]

See merge request !2082

Init script changes for gitlab-workhorse in 8.4

Goes with https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/31

Also bumps gitlab-workhorse to 0.6.1.

[ci skip]

See merge request !2529

Fix import of GitHub's wiki when the repository has not been created

Fixes #12503 

See merge request !2533

Fixes #4097

Closes #12491

Instrument Gitlab::Git::Repository



See merge request !2528

Added cache:key to .gitlab-ci.yml allowing to fine tune the caching

The `cache:key` allows you to define the affinity mask of caching, allowing to have single cache for all jobs, or cache per-job, or per-branch, or any other way you would need:

1. Cache per-build for all branches:

```
cache:
    key: "$CI_BUILD_NAME"
    untracked: true
```

2. Cache per-branch for all jobs:

```
cache:
    key: "$CI_BUILD_REF"
    untracked: true
```



/cc @DouweM @grzesiek @axil


See merge request !2436

This adds instrumentation for the instance methods of
Gitlab::Git::Repository.