added comments
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/cz/muni/fi/pv168/addressbook/entity/Person.java
	src/main/java/cz/muni/fi/pv168/addressbook/manager/AddressManager.java
	src/main/java/cz/muni/fi/pv168/addressbook/manager/PersonException.java
	src/main/java/cz/muni/fi/pv168/addressbook/manager/PersonManager.java
	src/main/java/cz/muni/fi/pv168/addressbook/manager/PersonManagerImpl.java