Added population statistics (#40)
	modified:   res/lang/DE.xml
	modified:   src/animation/AnimationManager.java
	modified:   src/game/Game.java
	modified:   src/game/Main.java
	renamed:    src/game/MonthlyTransactions.java -> src/game/MonthlyActions.java
	modified:   src/game/ResourceManager.java
	modified:   src/gui/GUI.java
	modified:   src/objects/BigHouse.java
	modified:   src/objects/House.java
	deleted:    src/objects/stadtzentrum.mtl
	deleted:    src/objects/stadtzentrum.obj
	modified:   src/res/lang/DE.xml

	src/gui/GuiGraph.java
	src/gui/GuiQuad.java