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