MockObject should be smarter about recording args vs kwargs

[ivancrneto]

Given the object:

class Foo(object):
    def bar(one, two, three=None):
        pass

When recording or replaying a MockObject(Foo)

 m_foo = mox.MockObject(Foo)
 # should be recorded in the same for both calls.
 m_foo.bar(1, 2, 3)  
 m_foo.bar(1, 2, three=3)

And verify should work for either:

 m_foo.bar(1, 2, 3)
 m_foo.bar(1, 2, 3)

... or ...

 m_foo.bar(1, 2, three=3)
 m_foo.bar(1, 2, three=3)

... or any combination thereof ...

This would require inspecting the method signature, and properly mapping
keyword args, where appropriate.