log tuples to files, now trying to use through Cstore
cstore implemented, names files based on relation_key
replacing testemit with cstore
'both' option in cstore to create file and pass tests expecting console.out
adding exceptions, removing unused code, edits overall
switching default emitprint to console
more efficient file store
rename rule
Merge pull request #270 from uwescience/yorkw-cstore

Implementing CStore