Added event handling for paymentWindow
Code cleanup
Merge branch 'development' of https://github.com/SETeam42014/test.git
into development

Conflicts:
	POS/src/ee/ut/math/tvt/salessystem/ui/tabs/PurchaseTab.java
	POS/src/ee/ut/math/tvt/salessystem/ui/tabs/StockTab.java
Merge with remote