several updates, 1 breaking the implicit call.

[perlauge]

Works on multiple source directories - needed if not using the convention, as main/java/src is the first element in the list of source directories.

Leveraging the convention references as opposed to hardcoded values

Updated the deprecated use of reportsDir

Made it a test task as opposed to enhancing the test task itself - this makes it possible to work with other test task, e.g. cobertura. But now you have to call "emma" explicitly.

/Per