Added drop down menu for items
Merge branch 'development' of https://github.com/MadisD/SoftwareEngineeringT4 into development

Conflicts:
	build/version.properties
	src/ee/ut/math/tvt/salessystem/domain/data/DisplayableItem.java
	src/ee/ut/math/tvt/salessystem/domain/data/SoldItem.java
	src/ee/ut/math/tvt/salessystem/ui/model/PurchaseInfoTableModel.java
	src/ee/ut/math/tvt/salessystem/ui/model/SalesSystemTableModel.java
	src/ee/ut/math/tvt/salessystem/ui/panels/PurchaseItemPanel.java
	src/ee/ut/math/tvt/team4/Intro.java