TW-9: Expand default token's TTL
TW-9: Renames `update-img-url-for-user` to `update-img-url-for-user!`
TW-9: Notifies the team when a new user is created

* UI automatically updates
* Only the concerned team is notified
Merge remote-tracking branch 'origin/master' into feature/TW-9_Notifications_for_new_users
TW-9: Update TTL comment
Merge branch 'feature/TW-9_Notifications_for_new_users' into develop