do not try to create databases for $passwordReset objects

[gr2m]

Right now it tries exactly that. To reproduce

1. Add this object to /_users

{
   "_id": "org.couchdb.user:$passwordReset/[email protected]/s7fdef2",
   "type": "user",
   "roles": [
   ],
   "password_scheme": "pbkdf2",
   "iterations": 10,
   "name": "$passwordReset/[email protected]/s7fdef2",
   "createdAt": "2013-12-06T14:20:57.331Z",
   "updatedAt": "2013-12-06T14:20:57.190Z",
   "derived_key": "76df1ca4b5ab7cba7cba56675e325e9b2030bfcc",
   "salt": "2fc93de856fb68b317029efcc00c4fd6",
   "$error": {
       "error": "not_found",
       "message": "user [email protected] could not be found"
   }
}

1. Start hoodie
2. You'll see the following error in the logs:

hoodie.database("user/undefined").grantReadAccess("$passwordReset", "[email protected]"): Error: not_found

Besides that, I also see hoodie.account.update: TypeError: Converting circular structure to JSON, not sure if that is related or not.