Show "Boundaries" checkbox in Leaflet layer control

This lets users toggle boundaries (e.g. neighborhoods, zip codes) via a checkbox in the Leaflet layers control.
Comment Moderation prototypes

Comment Moderation Page

Needs reviewed by Deb
Merge pull request #1589 from RickMohr/comment-moderation

Comment Moderation prototypes
Merge pull request #1587 from RickMohr/boundaries-checkbox

Show "Boundaries" checkbox in Leaflet layer control
wip
My Vagrantfile needs a static IP

So my provisioning VM can find it.
Everyone else's main machine is Linux so they provision from there.
Getting Ansible running on Windows looked non-trivial, so I created a Linux VM for provisioning.
Add shared folder for otm2-addons

Also added config for creating symlinks, but commented it out because I'm able to create symlinks
if I start the shell as Administrator.
??
Add shared folder for otm2-tiler
Use rsync for shared folders
rsync should ignore `node_modules`
Don't rsync otm2 and otm2-addons
Don't need to sync otm2-addons
Create synced folder for ecobenefits
Add shared directory for "clients" repo
Add shared directory for "modeling" service
Add shared folder for otm2-addons

Just so the provisioner can access its requirements.txt