can pickle MethodWrapperType; MethodWrapper and Method use save_instancemethod;
can pickle NamedLoggerType and SocketPairType
fix: added MethodWrapperType, PartialType to _typedict


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/dill@521 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/dill