Merge pull request #159 from chipaca/set_feats

py/map.c

py/map.h

py/objset.c

tests/basics/tests/set_add.py

tests/basics/tests/set_binop.py

tests/basics/tests/set_clear.py

tests/basics/tests/set_copy.py

tests/basics/tests/set_difference.py

tests/basics/tests/set_discard.py

tests/basics/tests/set_intersection.py

tests/basics/tests/set_isdisjoint.py

tests/basics/tests/set_isfooset.py

tests/basics/tests/set_iter.py

tests/basics/tests/set_pop.py

tests/basics/tests/set_remove.py

tests/basics/tests/set_symmetric_difference.py

tests/basics/tests/set_union.py

tests/basics/tests/set_update.py