Friendly predictor interface

[kylebgorman]

I am working on a simple wrapper class which loads the model and yields predictions, but the interface in predict.py is somewhat unfriendly for this...it has nice abstractions but they're not the ones I need.

I propose to improve predict.py and related bits to make this process more friendly, and put my completed "predictor" class could go into the examples directory.

[Adamits]

Sounds good! I think examples of how to, in python, do various things like quickly get predictions, or even eval, sounds nice.