Attaching an updated patch that includes unittests.

I also changed the set functions to take input as long's instead of int's 
as that is more likely to fit within a uid_t and forced the return values 
on the get's to fit within a long and used Py_BuildValue() to handle 
memory errors and such that could happen while allocating the ints and 
tuple rather than PyTuple_Pack.

Remaining work: os module documentation.