Ark
resolves #1920 - updates all files to conform to style settings.
closes #3080 - added users.invite() to add user from email with random password - added `GET /ghost/api/v0.1/users/` to invite users and resend invitations - removed one user limit - added global utils for uid generation - changed some „“ to ‚‘
closes #2690 - added new error classes - moved errorhandling.js to /errors/index.js - changed API errors to use new classes - updated tests