Ability to specify .props file for command line tools

by moving some code from Boot to Config (even though it doesn't really
belong in Config)
Enhanced Metafield

Separates a persistent metafield (i.e. one with an id, created_at, etc)
from one that we generate for submission to Shopify.  Also added some
more serialization and deserialization options
Ability to create/update a Variant by Metafield

Also added a deserializer
Added ability to add Metafields to a Variant

Also added PUT capability
Tool to connect our items to Shopify items

(primarily for development and testing purposes... but may polish it
later)