Clear the f_locals dict to avoid extra ref counts in the calling scope.  Closes pydata/numexpr#310.
Clear the f_locals dict to avoid extra ref counts in the calling scope.  Closes pydata/numexpr#310.

robbmcleod/numexpr,pydata/numexpr,robbmcleod/numexpr,pydata/numexpr,robbmcleod/numexpr,pydata/numexpr