Merge branch...

Merge branch '22459-tooltips-for-mini-pipeline-graph-in-pipeline-list-use-the-svg-instead-of-container' into 'master'

Fixed pipeline stage svg link tooltip

## What does this MR do?

Adds `display: block` to the `.stage-container` class which allows the dimensional constraints of the link to be calculated correctly so the `mouseover` events are fired correctly.

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

## Why was this MR needed?

Hovering the stage icons to reveal their SVG was buggy and would flash.

## Screenshots (if relevant)

![2016-09-23_14.59.17](/uploads/ad4c85fb08f032cc3f5d17749d3f7091/2016-09-23_14.59.17.gif)

I just realised that Gifox actually adds its own mouse that isn't positioned or sized correctly so this doesn't look right, you'll have to `checkout` to confirm.

/cc @dimitrieh I found a con about Gifox! 😆 

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #22459

See merge request !6494

app/assets/stylesheets/pages/pipelines.scss

@@ -177,6 +177,10 @@
           border-bottom: 2px solid $border-color;
         }
       }
+
+      a {
+        display: block;
+      }
     }
   }