#709 Pixel perfect in the main interface

The main interface (life, hunger, thirst, etc.) has a slight offset and  a the strange cut.

![interface_actuel](https://cloud.githubusercontent.com/assets/401965/5329081/3dbe68b4-7d9c-11e4-9c9f-8bb036b63fe7.png)

It would be better like this :

![interface_mod](https://cloud.githubusercontent.com/assets/401965/5329082/69d585fe-7d9c-11e4-9297-ce98818ec753.png)

#709