Comments & JavaDoc

Merge branch 'master' of https://github.com/Nic0w/OOAP_eBayLike_4A.git

Conflicts:
	src/main/java/fr/esiea/ooa/ebaylike/api/Buyer.java
	src/main/java/fr/esiea/ooa/ebaylike/api/Seller.java
cool