Only handlers can change the ticket status #33
Do not poll for ticket data

when marking a ticket as read.

We can just wait for the ticket model to get the data using
the 'componentWillReceiveProps' lifecycle event.

http://facebook.github.io/react/docs/component-specs.html#updating-componentwillreceiveprops

Also remove crazy amount of debug logging.

cc @jpkorhonen
Display ticket state button only for handlers
Remove Add device button #57

Not working currently and the priority to fix it is to low for now.