Boxstation

re-enabled boxstation and added our LS13 stuff to it.
Replaced the empty gateway room with maint

-added more maint secrets (much like the ones you would find on
metastation
-added secrets (much like the one on metastation)
-swapped the insanity ward in brig to a brig infirmary (much like the
one on metastation)
-removed zombie spawn point from virology
Merge pull request #117 from FlavoredCactus/BOXSTATION

Boxstation 
*Zombie stamp of approval*