3.0 add collapse from entire bar

With this modification it allow to use the empty space of the toolbar to collapse it.
![capture](https://cloud.githubusercontent.com/assets/4977112/4116722/8df897c8-3288-11e4-8c05-11bdf0684fcd.PNG)

I think that it can be quite convenient if you just want to toogle the toolbar quickly to see to timers or log displayed in the toolbar.

I didn't add the `cursor:pointer` for the whole toolbar is it show exactly where the buttons are but I can also update this if you feel that it's needed