error reporting

[pethopal]

Using complex DTO/Entities, which can contain many fields and/or validation logic, it could be hard, and time-consuming to find out which field is wrong in the line.
(i.e.: beside reporting the content of the line, from the Exception one could easily see what field caused the exception)

[joaomatossilva]

Hum... Seems a good idea.

[joaomatossilva]

should be released on version 0.8