'connect_output(other)
Connects the output of this tube to the input of another tube object.
Examples:
>>> def p(x): print x
>>> def recvone(n, data=[\'data\']):
...     while data: return data.pop()
...     raise EOFError
>>> a = tube()
>>> b = tube()
>>> a.recv_raw = recvone
>>> b.send_raw = p
>>> a.connected_raw = lambda d: True
>>> b.connected_raw = lambda d: True
>>> a.shutdown      = lambda d: True
>>> b.shutdown      = lambda d: True
>>> _=(a.connect_output(b), time.sleep(0.1))
data'

def connect_output(self, other):

    other.connect_input(self)
