Restored operators wrongly removed in previous commit
Restored operators wrongly removed in previous commit

andreabedini/numexpr,pydata/numexpr,robbmcleod/numexpr,robbmcleod/numexpr,andreabedini/numexpr,pombredanne/numexpr,andreabedini/numexpr,pombredanne/numexpr,pombredanne/numexpr,pydata/numexpr,pydata/numexpr,robbmcleod/numexpr