Type's __dict__s are not pickled

[matsjoyce]

Follow up for #41:

Python 3.4.1 (default, May 19 2014, 17:23:49) 
[GCC 4.9.0 20140507 (prerelease)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import abc, dill
>>> abc.ABCMeta.zzz=1
>>> dill.dump_session()
>>> 
================Restart================
Python 3.4.1 (default, May 19 2014, 17:23:49) 
[GCC 4.9.0 20140507 (prerelease)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import dill
>>> dill.load_session()
>>> abc.ABCMeta
<class 'abc.ABCMeta'>
>>> abc.ABCMeta.zzz
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object 'ABCMeta' has no attribute 'zzz'

This is due to https://github.com/uqfoundation/dill/blob/master/dill/dill.py#L808-L813 not adding the __dict__ attribute:

>>> dill.dill._trace(True)
>>> dill.dumps(abc.ABCMeta)
T4: <class 'abc.ABCMeta'>
b'\x80\x03cabc\nABCMeta\nq\x00.'

[mmckerns]

Also realized that dilldoesn't ever do anything specific for class instances, but it could. See new but not active code in 5f1774d.