Create User RESTful Web Service that response on JSON.
Create JSONBuilder class that serialize classes to JSONOblects.
Add Jersey and Gson jar's.
Update Model classes.
Update DAO's, DAO transformers and Model classes.
Create User setter class, update Models, DAO's and Transformers.
Create GenericService and UserService interfaces, UserServiceImpl with 
createItem implementation.
mergin branches
Merge branch 'chemodurov' into webservice

Conflicts:
	BuyIt/WebApp/WEB-INF/web.xml
	BuyIt/build/classes/com/epam/lab/buyit/model/Product.class
	BuyIt/src/main/java/com/epam/lab/buyit/model/Product.java

Update UserWebService, JSONBuilder, implement getItemById 
in UserServiceImpl, create UserSerializationAdapter
Create UserSerializationAdapter
Implement ContactDAO, UserDAO, AddressDAO getAllItems methods.
Update JSONBuilder with list serialization method. Update UserWebService
with get all users method.
Create UserListSerializationAdapter
Add UserListSerializaationAdapter
Add User Creator, Validator for input Data for RegistrationServlet 
Add error404 page
Change registration servlet and jsp files