Improve MockObject description for classmethod

[ivancrneto]

import unittest
import mox

class Foo(object):

    @classmethod
    def some_method(cls):
        pass

class TestFoo(mox.MoxTestBase):

    def setUp(self):
        super(TestFoo, self).setUp()
        self.mox.StubOutWithMock(Foo, 'some_method')

    def test_some_method_is_called(self):
        Foo.some_method()
        self.mox.ReplayAll()

if __name__ == '__main__':
    unittest.main()

python test.py 
F
======================================================================
FAIL: test_some_method_is_called (__main__.TestFoo)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/kparmar/sources/pymox/mox.py", line 2120, in new_method
    mox_obj.VerifyAll()
  File "/Users/kparmar/sources/pymox/mox.py", line 318, in VerifyAll
    mock_obj._Verify()
  File "/Users/kparmar/sources/pymox/mox.py", line 559, in _Verify
    raise ExpectedMethodCallsError(self._expected_calls_queue)
ExpectedMethodCallsError: Verify: Expected methods never called:
  0.  instancemethod.__call__() -> None

Please provide any additional information below.
With the changes made from the patch, the output is -
python test.py 
F
======================================================================
FAIL: test_some_method_is_called (__main__.TestFoo)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/kparmar/sources/pymox/mox.py", line 2120, in new_method
    mox_obj.VerifyAll()
  File "/Users/kparmar/sources/pymox/mox.py", line 318, in VerifyAll
    mock_obj._Verify()
  File "/Users/kparmar/sources/pymox/mox.py", line 559, in _Verify
    raise ExpectedMethodCallsError(self._expected_calls_queue)
ExpectedMethodCallsError: Verify: Expected methods never called:
  0.  Foo.some_method.__call__() -> None