cmd option should not require PyQT dependency

[orsenthil]

$ turpial -i cmd
Could not initialize QT interface.
No module named PyQt4.QtGui
Traceback (most recent call last):
  File "/Users/skumaran/.pyenv/versions/trials/bin/turpial", line 8, in <module>
    load_entry_point('turpial==3.0', 'console_scripts', 'turpial')()
  File "/Users/skumaran/.pyenv/versions/trials/lib/python2.6/site-packages/turpial-3.0-py2.6.egg/turpial/main.py", line 106, in main
    t = Turpial()
  File "/Users/skumaran/.pyenv/versions/trials/lib/python2.6/site-packages/turpial-3.0-py2.6.egg/turpial/main.py", line 66, in __init__
    self.ui = util.INTERFACES[options.interface](debug=options.debug)
TypeError: __init__() got an unexpected keyword argument 'debug'