More changes for python3 compatibility
WIP fixing more python3 integration
Added a "length" comparator
WIP Fixed stubbing of type objects
Mostly sure that unbound methods can't be stubbed in python3
Fixing imports and python2 cases for stubbing unbound methods
More python2 and 3 compatability refinements
WIP a small amount of py3 support
WIP more python3 support
Passing tests for python3
Documenting that Python 3 does not support stubbing unbound methods