TODO
A Snapshot is a snapshot in time. For example, if you were to reqest the snapshot of yesterday at 12pm, you would get back a list of all vehicles with their last known positions at that time. Callback is any number you like ,and will be sent back with the reply. Display a waiting indicator, and if a callback is not received in 30 seconds, show a timeout dialouge.
{
Snapshot:{
"callback":123,
"newestDate":3472092000,
}
}
