Addition of groupedit tool that leverages gatekeeper

@kentquirk 

This PR is a new groupedit tool that leverages gatekeeper instead of the old trifecta of services.  I've tested it out on devel and it appears to be working.

You can try it out by looking in the `test-tools` directory on coo.  The configs are slightly different (addition of a parameter), so when we want to actually pull this into the `tools` directory, we need to make sure to copy those configs back into `tools`.

LMK what you think.
Do you have a philosophical objection to including a hashbang line and making this executable so you don't have to type node first? I would prefer to see #! /usr/bin/env node here.