[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.
- Adde jomla logo (and info icon) to IcoMoon set
- Fixed hover issue on admin menus.
![l5co207qx9](https://f.cloud.github.com/assets/744259/1092409/3f8bb836-167d-11e3-97d6-b2698e4b46bf.png)

Note: This PR also includes https://github.com/joomla-projects/joomla-cms/pull/204 and should be merged after that one.