Should check for festival installed on ubuntu

[dtmilano]

    self.sayText(Concertina.sayRandomText())
  File "/usr/local/lib/python2.7/dist-packages/androidviewclient-15.3.1-py2.7.egg/com/dtmilano/android/culebron.py", line 770, in sayText
    ViewClient.sayText(text)
  File "/usr/local/lib/python2.7/dist-packages/androidviewclient-15.3.1-py2.7.egg/com/dtmilano/android/viewclient.py", line 3896, in sayText
    pipe = subprocess.Popen(['/usr/bin/festival'])
  File "/usr/lib/python2.7/subprocess.py", line 711, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1343, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory