Limit Firebase Security permissions to only allow users to edit their own data

[anubhav94]

See here: http://stackoverflow.com/questions/15167981/how-do-i-use-firebase-simple-login-with-email-password

{
"rules": {
"users": {
"$userid": {
".read": "auth.id == $userid",
".write": "auth.id == $userid"
}
}
}
}