Removed some CSS rules as the toolbar can now be configured through the settings

As the toolbar can now be configured through the settings.json file, these custom CSS rules can be removed
Not necessarily, those background icons are part of a sprite so if we don't set a fixed height and the line wraps a bit, the top of the next icon in the sprite shows. 

![image](http://cl.ly/image/3F0m0d2c222y/Screen%20Shot%202014-07-31%20at%2022.02.30.png)