Initial work demo-ing proof of concept on special bool.
Fix rep for msgpack.
Clean up bool impl.
Remove extraneous import
Add regression test that ensures we can still write Python bools even though they read as transit_type bools.
removed hanging import after revision to bools
Ensure basic logic ops still work w transit Booleans.
Doc enhancement around new Boolean type.
Implemented transit_types.Boolean plus true,false.