badly named namedtuple fails in python 3.5 and 3.6

[mmckerns]

For python3.5 one test fails in test_classdef.py:

>>> from collections import namedtuple
>>> Z = namedtuple("Z", ['a','b'])
>>> Zi = Z(0,1)
>>> X = namedtuple("Y", ['a','b'])
>>> X.__name__ = "X"
>>> Xi = X(0,1)
>>> import dill
>>> assert Z == dill.copy(Z)   
>>> assert Zi == dill.copy(Zi)
>>> dill.detect.errors(X)
PicklingError("Can't pickle <class '__main__.Y'>: it's not found as __main__.Y",)
>>> dill.detect.trace(True)
>>> assert X == dill.copy(X)
T6: <class '__main__.Y'>
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pickle.py", line 268, in _getattribute
    obj = getattr(obj, subpath)
AttributeError: module '__main__' has no attribute 'Y'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pickle.py", line 907, in save_global
    obj2, parent = _getattribute(module, name)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pickle.py", line 271, in _getattribute
    .format(name, obj))
AttributeError: Can't get attribute 'Y' on <module '__main__' (<_frozen_importlib_external.SourceFileLoader object at 0x10b3910b8>)>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mmckerns/lib/python3.5/site-packages/dill-0.2.5.dev0-py3.5.egg/dill/dill.py", line 161, in copy
    return loads(dumps(obj, *args, **kwds))
  File "/Users/mmckerns/lib/python3.5/site-packages/dill-0.2.5.dev0-py3.5.egg/dill/dill.py", line 197, in dumps
    dump(obj, file, protocol, byref, fmode, recurse)#, strictio)
  File "/Users/mmckerns/lib/python3.5/site-packages/dill-0.2.5.dev0-py3.5.egg/dill/dill.py", line 190, in dump
    pik.dump(obj)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pickle.py", line 408, in dump
    self.save(obj)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pickle.py", line 475, in save
    f(self, obj) # Call unbound method with explicit self
  File "/Users/mmckerns/lib/python3.5/site-packages/dill-0.2.5.dev0-py3.5.egg/dill/dill.py", line 1133, in save_type
    StockPickler.save_global(pickler, obj)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pickle.py", line 911, in save_global
    (obj, module_name, name))
_pickle.PicklingError: Can't pickle <class '__main__.Y'>: it's not found as __main__.Y
>>> X.__name__ = "Y"
>>> Y = X
>>> assert Y == dill.copy(Y)
T6: <class '__main__.Y'>
# T6
>>> 

[mmckerns]

Ok, so this particular test case has been fixed by using __qualname__ instead of __name__ for python 3.5+ (i.e. the below):

    X = namedtuple("Y", ['a','b'])
    if hex(sys.hexversion) >= '0x30500f0':
        X.__qualname__ = "X" #XXX: name must 'match' or fails to pickle
    else:
        X.__name__ = "X"
    Xi = X(0,1)

There's still the issue that a badly named namedtuple fails to serialize... but I think that's not the point of this issue.

[mmckerns]

see #72