Fixing debug toolbar - #1747

See https://github.com/yiisoft/yii2/issues/1747

Some screenshots

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#### Normal site page (wide enough)
All panels fits

![1741-1](https://f.cloud.github.com/assets/374554/1844312/498b5b26-7518-11e3-8a8d-27811e7cb21b.png)

***

#### Normal site page (resized)
Panels don't fit in one line.

![1741-2](https://f.cloud.github.com/assets/374554/1844313/4def922c-7518-11e3-9f3c-bf5439430140.png)

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#### Debug page
Panels don't fit in one line, jump
.
![1741-3](https://f.cloud.github.com/assets/374554/1844315/5138cc50-7518-11e3-991e-51b0c387de23.png)

***

#### Debug page (resized)
Panels don't fit in one line, more jump, and the body padding change wile the toolbar increases its height

![1741-4](https://f.cloud.github.com/assets/374554/1844316/553e3ae2-7518-11e3-8f1d-a0d520eb77e4.png)