'Initialize StaleTransaction monitor
Args:
timeout: how often to check for stale tx (in sec)
backlog_reassign_delay: How stale a transaction should
be before reassignment (in sec). If supplied, overrides
the Bigchain default value.'

def __init__(self, timeout=5, backlog_reassign_delay=None):

    self.bigchain = Bigchain(backlog_reassign_delay=backlog_reassign_delay)
    self.timeout = timeout
