Implementazione del carrello.
Conflitti risolti.

Merge branch 'master' of https://github.com/fievelk/kmZeroSpring.git

Conflicts:
	WebContent/WEB-INF/spring/tiles-defs.xml
	WebContent/WEB-INF/views/layout/01_header.jsp
	WebContent/WEB-INF/views/login.jsp
	WebContent/WEB-INF/views/welcome.jsp
	src/META-INF/persistence.xml