Adjust action-bar buttons according to issue #11577

Some adjustments according to peoples comments and mockup by @eladnova in issue #11577

- Decreased padding
- Decreased spacing between buttons
- Primary button color adjusted
- Primary button hover state adjusted
- White button border adjusted
- Button text color adjusted

![action-button-change](https://cloud.githubusercontent.com/assets/670705/3463316/49d75a3c-0238-11e4-8cb7-a1c511c3a62a.png)