Add capability for class-wide facts
Updated implementation of class facts to make them resolve/bind upon instance query rather than at instantiation
ditch nil check on sym in fact definitions - caveat emptor instead
Added Event#get_fact
Studier focuses on fact_weights
facts are now facets
Studier is now Correlator
Event is now Datum
Simplify Correlator#study to ingestion only and rename to #ingest
Added PersonCorrelator#select_by
Correlating with ranges...