Pickle support

One thing that had been missing from my sklearn-weka-plugin library was serialization support via pickle.

Since I’m relying on my python-weka-wrapper3 library, I had to incorporate pickle support there first. This resulted in a new release: 0.2.1

With that in place, I didn’t really have much to do for a sklearn-weka-plugin release, merely requiring the latest version of pww3, push that out as 0.0.2. 🙂