Remove admin menu when a user is read-only -> set toolbar closed by default in some cases

Regarding to "Remove admin menu when a user is read-only" as discussed in
![2a3d3c52-828e-11e3-850f-8bb0ce5bd013](https://f.cloud.github.com/assets/99186/1972644/3f962320-834c-11e3-88a6-6327a8153a08.png)
It is crucial to leave a simple way for any authenticated user to logout easily and to go to its account page.

The only simple idea I could think of is to hide the toolbar by default, so it will look like this:
![b41f28ea-828e-11e3-9263-8b9384e5fc59](https://f.cloud.github.com/assets/99186/1972646/483a32aa-834c-11e3-95a2-5c14d112e15e.png)