Merge branch '23718/backup-rake-task-human-readable' into 'master'

23718/backup rake task human readable

## What does this MR do?
Add the human readable format to the backup tar file. 
From `1477317140_gitlab_backup.tar` to `1477317140_2016_10_24_gitlab_backup.tar`.

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

## Why was this MR needed?
#23718 issue
## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) 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
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [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 it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
23718

See merge request !7188

1 files changed, 4 insertions, 0 deletions

diff --git a/changelogs/unreleased/23718-backup-rake-task-human-readable.yml b/changelogs/unreleased/23718-backup-rake-task-human-readable.yml
new file mode 100644
index 00000000000..2e7583244ac
--- /dev/null
+++ b/changelogs/unreleased/23718-backup-rake-task-human-readable.yml
@@ -0,0 +1,4 @@
+---
+title: Add Human Readable format for rake backup
+merge_request: 7188
+author: David Gerő