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.
![7a95f29rip](https://f.cloud.github.com/assets/744259/1092398/cf74666a-167c-11e3-9f3a-f140b298f3ca.png)