v0.2.0.dev0

• Implement smoother, which incorporates both past and future information (feb1db0)
• Allow user to specify lfp_model, which can be any scikit-learn kernel density estimator (5309783)
• Raise NotImplemented Errors for loading and saving models (c8bcc93)
• Convert all data to numpy arrays to handle Pandas DataFrames (a4f58c0)
• Added some model checking plots (ecc8d4c)
• Remove speed from default likelihood (37a6d6a)