Transparent button styles

New concept, what do you think? (When you hover over the icons they become black, thus more visible).

![schermafbeelding 2014-11-06 om 21 36 10](https://cloud.githubusercontent.com/assets/1244416/4943453/965c5e64-65f4-11e4-9d02-a035ea2708ab.png)

The reason I want to remove as much chrome (not the browser) as possible is because I believe the tool (the grid editor) works best when it's there when you need it, but isn't the primary focus when you're not using it.

Ps. If I have more idea's, I'll let you know.