Added a clean command to setup.py.
Added a clean command to setup.py.

tectronics/numexpr,Alwnikrotikz/numexpr,Alwnikrotikz/numexpr,ooguntola/numexpr,Alwnikrotikz/numexpr,ooguntola/numexpr,ooguntola/numexpr,tectronics/numexpr,tectronics/numexpr