Update administration-interfaces.txt

![home](https://f.cloud.github.com/assets/3208316/1459405/92ef54c2-43d4-11e3-890d-27e3283b461d.png)

Added a new mongoDB Admin-UID. (Not sure how to add an image but have attached above.)

Let us know if there is anything to sign or I need to change.

Thanks.