Move implementation of load and save into __setstate__ and __getstate__.

[dnouri]

Using the pickle protocol allows us to use pickle on the class instance itself.

[Slater-Victoroff]

Sorry for the slow reply again.

Love it! Is there any way you could add a docstring and/or a test for the save/load interface?

With that I think we can merge pretty immediately.

[moneyatindico]

These are no longer applicable, closing