[MAP] Wizard Ship / Nuke Ops Base Immersion Change / ERT Ready Room

Three changes, one big and two minor. I'll explain all three from the top. All only affect the second Z-Level.

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Wizard Ship

This change removes the Wizard's Den and replaces it with the Wizard's ship. This was prompted primarily due to the fact that a Wizard using the Scything Orb (which grants them X-Ray vision) could see that not only are they in a box in space, but right next to the Nuke Op Base and Central Command.

Currently the Wizard's Ship does not go anywhere, any discussion on having the Wizard be able to fly his ship to the station z-level is a balance discussion.

Ship as it stands in game.
![screenshot 2014-12-22 20 04 34](https://cloud.githubusercontent.com/assets/6595389/5524825/ba08c2d0-8a16-11e4-82f1-291910a7aac5.png)

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Nuke Ops Base Immersion Change

Minor change to the Nuke Ops ready room window, if you stood  near the window you could see the exterior wall (aka: the fourth wall) surrounding the ops base. I simply extended the snow tiles southwards.

In game apperance
![screenshot 2014-12-22 20 05 52](https://cloud.githubusercontent.com/assets/6595389/5524839/f18f7e56-8a16-11e4-8576-ee3972275ae6.png)

Overall change
![screenshot 2014-12-22 20 06 04](https://cloud.githubusercontent.com/assets/6595389/5524844/fecbe7da-8a16-11e4-8c51-2e25ab4740b7.png)

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ERT Ready Room

First part of my ERT PR, simply adds in the ERT Ready Room to Central Command. Only has the tiles and walls set up with a wooden barricade at the front. (Meant to simulate the "construction" of the ERT room if you will).

This will not affect normal game play in any possible way.

Overall change
![screenshot 2014-12-22 20 06 20](https://cloud.githubusercontent.com/assets/6595389/5524854/36bc6322-8a17-11e4-80a7-db6c9096b24a.png)