Map Update. Icarus is here!

Added in a mostly-functional Icarus. Of course, whether or not launching
drones at Hypatia is possible remains to be seen, but at least she's a
spaceworthy thing w/ a basic Atmos system. Can have mapmerge be used w/
any more of Juani2400's edits, but the z-level amount is now set to 7 in
order to compensate for the space the Icarus and the other features of
its z-level take up.

![space station 13 2014-04-24 152111](https://cloud.githubusercontent.com/assets/4933842/2796683/53f6f1f2-cc15-11e3-943a-8f61133298d0.png)