Email alias feature

[cnrdh]

Mechanism to allow login with different emails connected to the same account (short@ vs. full.name@)

[cnrdh]

Hmm, we can maybe handle this on the client (simply looking up logins without a ".")

[cnrdh]

Implies "type" (alias|user) needs to be added to all users

{
   "_id": "[email protected]",
   "email": "[email protected]",
  "type": "alias"
}