Tuples don't work as keys

[badochov]

There is some issue with numpy.vectorize when using tuples as keys and this class doesn't work

[hagai-helman]

Had the same problem.

union() and find() work perfectly, as far as I noticed, and so does n_comps (I haven't verified the correctness of the outputs, but the code doesn't raise exceptions); But components(), for example, raises an exception. Specifically, it tries to lookup the elements of the tuples.