def stepStarted(build, step):
    """A step has just started. 'step' is a dictionary which
        represents the step: it can be queried for more information.

        This method may return an IStatusReceiver (it could even return
        'self'). If it does so, logStarted and logFinished methods will be
        invoked on the object for logs created by this one step. This
        receiver will be automatically unsubscribed when the step finishes.

        Alternatively, the method may return a tuple of an IStatusReceiver
        and an integer named 'updateInterval'."""
