Removed dependency of "source" and "target" attributes for custom actions.
Removed dependency of "source" and "target" attributes for custom actions.

dahmage/nantcontrib,cgourlay/nantcontrib,nant/nantcontrib,nant/nantcontrib,rmboggs/nantcontrib,cgourlay/nantcontrib,nant/nantcontrib,dahmage/nantcontrib,rmboggs/nantcontrib,cgourlay/nantcontrib,rmboggs/nantcontrib,dahmage/nantcontrib