import numpy & scipy in knn_dtw_class.py

[Markus Steger]

np.shape & scipy.spatial.distance are being used w/o previous import of those modules.

[Mark Regan]

Thanks for flagging. I'll run through the notebooks in the coming weeks.

[Mark Regan]

Notebook has been updated to fix this issue.
knn_dtw_class.py has been removed to repo to avoid having to update two duplicate sources.

Thanks for flagging @stgrmks