Added globalConfig subsection in WebInterface

Hi,

I implemented a subsection in the Webinterface for the Global Configurations. It looks like this
![bildschirmfoto 2014-06-06 um 15 53 49](https://cloud.githubusercontent.com/assets/5738978/3200919/24c21c8e-ed82-11e3-846c-4f24ef3687b5.png)
![bildschirmfoto 2014-06-06 um 15 53 58](https://cloud.githubusercontent.com/assets/5738978/3200924/2cbb5d9c-ed82-11e3-8d4c-e0aeb006ccea.png)

@rmetzger
how about calling the variable "config" or "configuration" or so?