[JUX] Changed layout of top menu bar

- Added Joomla logo with link to admin on left.
- Moved site name + link to frontend to left.
- Replaced user name with cog icon.
- Moved main logo in toolbar to right.
- Changed font sizes to be more coherent.

In below screenshots "Joomla 3.0 dev" is the website title.

![z4q7h](https://f.cloud.github.com/assets/744259/1249406/dc63eacc-2adf-11e3-86fc-2df49645faa9.png)

![d94lv](https://f.cloud.github.com/assets/744259/1249421/388e51de-2ae0-11e3-8d62-417c8fe70dc5.png)

Screen size up to 767px
![ismu7](https://f.cloud.github.com/assets/744259/1249446/7808a5da-2ae0-11e3-9a73-23dc9b44b645.png)

Screen size up to 480px
![ts084](https://f.cloud.github.com/assets/744259/1249447/7ac11c9e-2ae0-11e3-8cc9-6ed7fb1ce4d5.png)

#### Updated bootstrap.js ?
- To fix hover issue on admin menus