Should add an API method for ensuring all active teams are started

[zachfeldman]

Maybe this isn't the best way to do this. But when I authenticate/add a new team from my own custom integration, the service doesn't start. I solved this by adding an API method that starts all teams with a flag of "active".

Another related issue is that there's no checking that an instance already has a thread running that's connected to it, which would help with this issue, I filed separately for that:
#39