un-pollute instance data

#28
Resolves data pollution caused by repeat calls to setup with varying data shapes

Dependabot-triggered uplift

dub-dependency updated for y18n, handlebars, glob-parent, lodash

dependency bumps

mocha version bump
travis.yml / node version bump

Brie capabilities, extended

v3.0.0

extended brie capabilities to include 'allowValues' and 'rejectValues…

npm audit suggested updates

updates to package and dependencies to satisfy audit readout. follows #13

Salting, explained

Minor updates to the Readme will help explain some of the power of the salt value.