Enhancement
-----------
Renamed a poorly named variable.  The result of member.cls_factory() was
'cls_factory'.  Now 'build_cls'.
Bug Fix
-------
Inheritance did not work correctly.  Parent Members were not added to
the _member_set.
Merge branch 'master' of git@github.com:schlameel/JsonCls.git
Enhancement
-------------
Added 'force_mapper' option.  Allows for the choice of pushing a Mapper
to inherited Members.