Merge branch '21781-pipelines-for-mr' into 'master'

Change widths of content in MR pipeline tab

## What does this MR do?
* Fixes width of items in pipelines tab
* Removes scrollbars on Windows

## Screenshots (if relevant)
![Screen_Shot_2016-09-01_at_2.40.55_PM](/uploads/2163022eb325b9b0eca2f2003416e100/Screen_Shot_2016-09-01_at_2.40.55_PM.png)

#### What are the relevant issue numbers?
Closes #21396 
Closes #21781

See merge request !6157

app/assets/stylesheets/pages/pipelines.scss

@@ -474,12 +474,16 @@
 .pipelines.tab-pane {
 
   .content-list.pipelines {
-    overflow: scroll;
+    overflow: auto;
   }
 
   .stage {
-    max-width: 60px;
-    width: 60px;
+    max-width: 100px;
+    width: 100px;
+  }
+
+  .pipeline-actions {
+    min-width: initial;
   }
 }