UI tweaks in history viewer > actions

Fix the spacement in the commit subject when this have more that one line and repositioned the actions block and close bottom.

![captura de tela 2014-04-16 as 12 18 04](https://cloud.githubusercontent.com/assets/1726914/2721378/f04321a8-c57a-11e3-8e27-757000653526.png)
![captura de tela 2014-04-16 as 12 18 19](https://cloud.githubusercontent.com/assets/1726914/2721381/f397d376-c57a-11e3-8eba-416ee5c92771.png)