play-testing role changes for production idm data

[jeffreywescott]

• [x] add player and moderator roles to @shereefb and @tannerwelsh
• [x] add moderator role to @carlabagdonas
• [x] create invite code for moderators in play-test chapter
• [x] invite @needdra using playtest-2016-may-moderator invite code
• [x] invite @prattsj
  • [ ] create invite code playtest-2016-may-backoffice with all three roles (player, moderator, and backoffice)
• [x] invite @LaviniaFrank and @envisionwithjustin (GH handle?) to sign-up using playtest-2016-may invite code on IDM

[jeffreywescott]

See also: game/#90