Pipelines ui updates

#### What does this MR do?
* Fixes hover color width on build list
* Fixes alignment of status icon on commits page
* Add play icon SVG

#### Why was this MR needed?
Small UI bugs with recent MRs

![Screen_Shot_2016-08-17_at_5.54.32_PM](/uploads/a5f1a38eac332865b17d8d74eeaa5142/Screen_Shot_2016-08-17_at_5.54.32_PM.png)
![Screen_Shot_2016-08-17_at_5.56.43_PM](/uploads/90608eee3e83dbe14244ff2be5a8867e/Screen_Shot_2016-08-17_at_5.56.43_PM.png)
![Screen_Shot_2016-08-18_at_9.18.37_AM](/uploads/9c1265fc3efa7b6084e2368d3fe458cd/Screen_Shot_2016-08-18_at_9.18.37_AM.png)

See merge request !5856