Automatically add and uninstall Original Ref Fields

Problem/Motivation

This module requires a field to hold hash values, which right now, users are required to manually add.

Proposed resolution

Using config and .install, automatically add and remove those fields on install/uninstall

Remaining tasks

• Using config and .install, write code to automatically add and remove those fields on install
• Using .install, write code to remove those fields that exist on uninstall
• Update README.md