[Cython] Speedup module-level lookup

[Chris Colbert]

AFAIK, a module's dict is readonly, so I don't believe a dict subclass will
work there (I could be wrong) unless you hack up the module object from C.
You can do it with descriptors on a ModuleType however, which should be
plenty fast from Cython-land.

In [16]: class AGetter(object):
   ....:     def __get__(self, obj, cls):
   ....:         return obj.a
   ....:     def __set__(self, obj, val):
   ....:         obj.a = val
   ....:

In [17]: class MyMod(types.ModuleType):
   ....:     b = AGetter()
   ....:

In [18]: mmod = MyMod('my_mod')

In [20]: mmod.__dict__['a'] = 42

In [21]: mmod.a
Out[21]: 42

In [22]: mmod.b
Out[22]: 42

In [23]: mmod.b = 87

In [24]: mmod.a
Out[24]: 87
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