SFrame filter_by should work with map data type

[TobyRoseman]

This is only an issue in Python 3.

import turicreate as tc
toy_data = tc.SFrame({'a': range(100)})
any_map_result = map(lambda x: x+1, [1, 30])

# this should work but instead we get a type error
toy_data.filter_by(any_map_result, 'a')