Find the target name for this build.

        :returns: deferred that when fired returns the build task's target
                  name. If we could not determine the build task, or the task's
                  target, return None.

def target(self):
        """
        Find the target name for this build.

        :returns: deferred that when fired returns the build task's target
                  name. If we could not determine the build task, or the task's
                  target, return None.
        """
        task = yield self.task()
        if not task:
            yield defer.succeed(None)
            defer.returnValue(None)
        defer.returnValue(task.target)