Adding details to Slack skill

Updated slack skill, made it helpful to refactoring skill, added name to contributors
Adding fix for JSON parsing in the stages_data.js editor

The way JSON.stringify was being called messed up the indentation of the JSON data which main diffing problematic.
Updating stages_data.js to fix indentation issues
Adding slack as helpful to refactoring

Accidentally overwrote the link from Slack to Refactoring... adding that back in
Merge pull request #2 from Matt-Hornsby/Build-In-Slack

Adding details to Slack skill