fix bugs with restarts/interrupts

The password reset daemon wasn't being closed on restarts, so an extra
pwr would be sent w/ every restart. Restarts & Interrupts (Ctrl-C)
rarely worked, as there were multiple listeners to the "RESTART"
channel, and I didn't know the message was consumed by whoever got it
first, meaning if the main thread didn't get it first, the app wouldn't
quit. Listeners are now registered, and the restart message is
re-broadcasted until everyone's got it.

Fixes #264

tray.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	"github.com/getlantern/systray"
 )
@@ -26,6 +27,8 @@ func onExit() {
 	if RUNNING {
 		QUIT = true
 		RESTART <- true
+		// Safety Sleep (Ensure shutdown tasks get done)
+		time.Sleep(time.Second)
 	}
 	os.Remove(SOCK)
 }