Update item_preview.jsp and item_preview.css. Add mock images.
add userProfileServlet, upgrade userProfile page
Merge remote-tracking branch 'origin/aleg' into chemodurov

Conflicts:
	BuyIt/WebApp/jsp/registration.jsp
	BuyIt/src/main/java/com/epam/lab/buyit/controller/creator/UserCreator.java
	BuyIt/src/main/java/com/epam/lab/buyit/controller/setters/UserSetter.java
Fix AJAX login cheking in login-check.js