Expands medbay with new rooms.

This is a neat little expansion I did to medbay based on requests in the thread. Adds the following rooms:
1. A backup generator room, with charger for cyborgs
2. A holomedical room for the CMO's private healing sessions
3. A psych ward for braindead patients
4. A xenomedical room for Vox patients
5. Other goodies, like an expanded surgical viewing room.

Do not merge yet. Escape pod has areas defined but isn't functional pending discussion over whether we want another pod at all. The thread seemed enthusiastic, but it's a controversial thing so worth discussing.

![medbay expansion](https://cloud.githubusercontent.com/assets/9782036/5264011/cef4aa1c-79fc-11e4-9b28-db646864ec02.png)


![holomedical](https://cloud.githubusercontent.com/assets/9782036/5263477/154c0542-79f7-11e4-8b14-1146fdaaead1.png)