Fix crash when using getargspec with xmlrpclib #202

>>> import xmlrpclib
>>> api = xmlrpclib.Server("http://localhost")
>>> api.login

Traceback (most recent call last):                                 
  File "/usr/local/bin/bpython", line 8, in <module>
    load_entry_point('bpython==0.10.1', 'console_scripts', 'bpython')()
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 1756, in 
main
    banner=banner)
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 1658, in 
curses_wrapper
    return func(stdscr, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 1727, in 
main_curses
    clirepl.repl()
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 1015, in 
repl
    inp = self.get_line()
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 600, in g
et_line
    if self.p_key(key) is None:
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 911, in p
_key
    self.addstr(key)
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 290, in a
ddstr
    self.complete()
  File "/usr/local/lib/python2.7/site-packages/bpython/cli.py", line 383, in $
omplete
    self.list_win_visible = repl.Repl.complete(self, tab)
  File "/usr/local/lib/python2.7/site-packages/bpython/repl.py", line 540, in 
complete
    if not self.get_args():
  File "/usr/local/lib/python2.7/site-packages/bpython/repl.py", line 511, in 
get_args
    self.argspec = inspection.getargspec(func, f)
  File "/usr/local/lib/python2.7/site-packages/bpython/inspection.py", line 23
2, in getargspec
    or (func_name == '__init__'))
  File "/usr/local/lib/python2.7/xmlrpclib.py", line 1224, in __call__
    return self.__send(self.__name, args)
  File "/usr/local/lib/python2.7/xmlrpclib.py", line 1570, in __request
    verbose=self.__verbose
  File "/usr/local/lib/python2.7/xmlrpclib.py", line 1264, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/local/lib/python2.7/xmlrpclib.py", line 1297, in single_request
    return self.parse_response(response)
  File "/usr/local/lib/python2.7/xmlrpclib.py", line 1468, in parse_response
    return u.close()
  File "/usr/local/lib/python2.7/xmlrpclib.py", line 793, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 1: 'Method "login.__name__.__eq__" is not supported'>