Added solution for exerise 15
Added an async demo
Merge branch 'master' of https://github.com/kvanrobbroeck/acaddemict-managed into jonathan
Merge branch 'master' of https://github.com/kvanrobbroeck/acaddemict-managed into jonathan + Timer

Conflicts:
	ticket-jar/src/main/java/be/ticket/entity/Passenger.java
	ticket-jar/src/main/resources/META-INF/ejb-jar.xml