Adding __all__ to user.py.
Adding __all__ to user.py.

AlanZatarain/pysal,Alwnikrotikz/pysal,AlanZatarain/pysal,tectronics/pysal,Alwnikrotikz/pysal,tectronics/pysal,AlanZatarain/pysal,Alwnikrotikz/pysal,tectronics/pysal