Add login

[joao-dp]

Add login functionality to the system. Each person registered in the application must have a password and it should store the last time the person has logged in the system.

Tasks:

• Update TestCrestePersonService #11 Update the TestCrestePersonService and the interface of CreatePerson service
• Update CreatePerson service #10 Modify CreatePerson service and domain to support a password for person
• Test LoginPerson #12 Define the tests for the LoginUser service and the interface of this service
• Implement LoginPerson service #13 Implement the LoginUser service