make checkInvite check only one invite, invite daemon

checkInvite no longer loops over all invites and checks for expiry, that
functionality has moved to checkInvites. Couple more rogue print
statements removed aswell.

main.go

@@ -13,6 +13,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"time"
 )
 
 // Username is JWT!
@@ -193,6 +194,9 @@ func main() {
 
 	ctx.email.init(ctx)
 
+	inviteDaemon := NewRepeater(time.Duration(60*time.Second), ctx)
+	go inviteDaemon.Run()
+
 	ctx.info.Println("Loading routes")
 	router := gin.New()