Remove Infection from Battlement

Removed because of the fact that people keep hiding in weird places in the trees and/or on the hill. This map doesn't really suit Infection either, it's more of a TDM-like map. Modes still available on Battlement as of this fix; 
-TDM and FFA
Merge pull request #136 from AnomalousDyna/patch-17

Remove Infection from Battlement