Store outgoing MessageService emails in a table

The MessageService and MessageServiceImpl allow you to send a notification to a user over email if the user has defined their email address in their "profile".

Add a table to store all messages sent to users through the 'MessageService'. This functionality will give the flexibility to the admin to check the db for the sent message logs, that are sent via email.

-Domain object name: SentMessage
-Table name: sent_message.

• Table Columns: sender (a user_id), recipient (a user_id), message, date_sent, type_of_message
• You will need to create a new hibernate mapping hbm.xml file for this new object to be able to persist the messages in the archive.
• Add methods to the API/DAO for CRUD operations for sent messages
• Include unit tests