Please add zend brand logos in navbar

This probably is not important, 
but it would be better if the navbar brand the zend logo is also added 
as the previous version twitter bootstrap version 2 ago :)
So branding zand framework will be remain
although only a beginning skeleton, but it's the first thing people see, Hhhee

old version
![zf2 skeleton application 2013-09-05 15-40-46](https://f.cloud.github.com/assets/4241620/1086829/fe1e9eba-1607-11e3-95ef-37ed03c9065e.png)

current version
![zf2 skeleton application 2013-09-05 15-41-31](https://f.cloud.github.com/assets/4241620/1086831/0c302226-1608-11e3-8586-9cc1407378ad.png)

Just a suggestion :D