added new abstractmodel class
removed now unused classes
made some of the models serializable
added appointment method
rewrote entire class, now sends objects instead of json
added appointment method
Merge branch 'master' of github.com:aleksanb/fellesprosjektet

Conflicts:
	src/core/ClientFactory.java
	src/db/Appointment.java
	src/db/JsonFactory.java
	src/server/Server.java
	src/server/ServerFactory.java