Created Spike to Test MovieLens data set/s

Ran MovieLens 100K through our engine and precision/recall have a much
better shape than our data as n increases (see MetricsSummary-100K.xlsx
for more details).

Not including a .sql or any MovieLens data files as this is a Spike for
testing purposes only.

Also fixed problem in ItemBasedCF that caused recommendations to only be
created for one neighbourhood size when multiple were requested.