Client 
 Meteor.loginWithPassword(user, password, [callback]) 
 import { Meteor } from 'meteor/meteor' Source 
 Log the user in with a password. 
Arguments
 user Object or String   Either a string interpreted as a username or an email; or an object with a single key: email, username or id. Username or email match in a case insensitive manner.   password String   The user's password.   callback Function   Optional callback. Called with no arguments on success, or with a single Error argument on