issue #134, changing incomplete methods to rasie NotImplementedError.
issue #134, changing incomplete methods to rasie NotImplementedError.

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