Fix for Transport.__del__ for late threads at shutdown.  Closes #36
Adds table deserialization of types s, b, U, u, i, L, l, f.
Updates changelog
Handle SSL closed socket bug

There is a bug in the python socket library wherein attempting
ssl.read/write on a closed socket raises an AttributeError instead of
IOError. We need to catch that case and raise an IOError.
Bumps version to 1.4.5 and updates Changelog