Admin Component Menu Icons: position fixed

New positions:
![Webdesign Joomla Agentur aus Hamburg - Administration - Systeminformationen - Mozilla Firefox 29 03 2013 095400](https://f.cloud.github.com/assets/1765163/316934/4544bec4-984e-11e2-8bb2-e6e9b6d29d9e.jpg)
Old positions:
![Webdesign Joomla Agentur aus Hamburg - Administration - Systeminformationen - Mozilla Firefox 29 03 2013 095454](https://f.cloud.github.com/assets/1765163/316939/63ef10c2-984e-11e2-8387-39106fd35bd8.jpg)