Positive Z-levels(WIP)

Since I want to add a second floor to the Rivtech facility, I need to get positive Z-levels working, since a lot of the base is already there.

After diving into the code(including that huge if statement in mapgen.cpp), I *think*, I know what needs to be done to get it working.
Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA into positive-z-levels
Added sky terrain, sky overmap
Finished up, everything seems to work, as I want.
Added 3-D version of Motel
Added 3-D version of Office Tower(empty) thanks to acidia
Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA into positive-z-levels
Split recipe json

Splits the recipe.json file into small easier to browse files by
category.   No more 31000 line long recipe.json.
Passenger_flag now beeing removed from affected vehicle part
Changed t_sky to t_open_air and changed the colours on them to make them more managable.
Fixed automap issue-apparently know up and know down are bad...
Transfered 3-D Buildings and made a mod.  Players will not be able to access new z-levels unless they use the debugger.
Reverted buildings back to their orignal settings.
Merge pull request #1 from CleverRaven/master

Update
Update for evac center
Added Evac Center
Added Evac Merchant and Guard Text
Added Evac Center
Added support for Evac shopkeeper
Added Evac Center
Added Placespecial NPC support